Articles, Blog

How we can turn the cold of outer space into a renewable resource | Aaswath Raman

November 9, 2019

Every summer when I was growing up, I would fly from my home in Canada
to visit my grandparents, who lived in Mumbai, India. Now, Canadian summers
are pretty mild at best — about 22 degrees Celsius
or 72 degrees Fahrenheit is a typical summer’s day,
and not too hot. Mumbai, on the other hand,
is a hot and humid place well into the 30s Celsius
or 90s Fahrenheit. As soon as I’d reach it, I’d ask, “How could anyone live, work
or sleep in such weather?” To make things worse, my grandparents
didn’t have an air conditioner. And while I tried my very, very best, I was never able
to persuade them to get one. But this is changing, and fast. Cooling systems today
collectively account for 17 percent of the electricity we use worldwide. This includes everything
from the air conditioners I so desperately wanted
during my summer vacations, to the refrigeration systems
that keep our food safe and cold for us in our supermarkets, to the industrial scale systems
that keep our data centers operational. Collectively, these systems
account for eight percent of global greenhouse gas emissions. But what keeps me up at night is that our energy use for cooling
might grow sixfold by the year 2050, primarily driven by increasing usage
in Asian and African countries. I’ve seen this firsthand. Nearly every apartment
in and around my grandmother’s place now has an air conditioner. And that is, emphatically, a good thing for the health, well-being
and productivity of people living in warmer climates. However, one of the most
alarming things about climate change is that the warmer our planet gets, the more we’re going to need
cooling systems — systems that are themselves large
emitters of greenhouse gas emissions. This then has the potential
to cause a feedback loop, where cooling systems alone could become one of our biggest sources
of greenhouse gases later this century. In the worst case, we might need more than 10 trillion
kilowatt-hours of electricity every year, just for cooling, by the year 2100. That’s half our electricity supply today. Just for cooling. But this also point us
to an amazing opportunity. A 10 or 20 percent improvement
in the efficiency of every cooling system could actually have an enormous impact
on our greenhouse gas emissions, both today and later this century. And it could help us avert
that worst-case feedback loop. I’m a scientist who thinks a lot
about light and heat. In particular, how new materials
allow us to alter the flow of these basic elements of nature in ways we might have
once thought impossible. So, while I always understood
the value of cooling during my summer vacations, I actually wound up
working on this problem because of an intellectual puzzle
that I came across about six years ago. How were ancient peoples
able to make ice in desert climates? This is a picture of an ice house, also called a Yakhchal,
located in the southwest of Iran. There are ruins of dozens
of such structures throughout Iran, with evidence of similar such buildings
throughout the rest of the Middle East and all the way to China. The people who operated
this ice house many centuries ago, would pour water
in the pool you see on the left in the early evening hours,
as the sun set. And then something amazing happened. Even though the air temperature
might be above freezing, say five degrees Celsius
or 41 degrees Fahrenheit, the water would freeze. The ice generated would then be collected
in the early morning hours and stored for use in the building
you see on the right, all the way through the summer months. You’ve actually likely seen
something very similar at play if you’ve ever noticed frost form
on the ground on a clear night, even when the air temperature
is well above freezing. But wait. How did the water freeze
if the air temperature is above freezing? Evaporation could have played an effect, but that’s not enough to actually
cause the water to become ice. Something else must have cooled it down. Think about a pie
cooling on a window sill. For it to be able to cool down,
its heat needs to flow somewhere cooler. Namely, the air that surrounds it. As implausible as it may sound, for that pool of water, its heat
is actually flowing to the cold of space. How is this possible? Well, that pool of water,
like most natural materials, sends out its heat as light. This is a concept
known as thermal radiation. In fact, we’re all sending out our heat
as infrared light right now, to each other and our surroundings. We can actually visualize this
with thermal cameras and the images they produce,
like the ones I’m showing you right now. So that pool of water
is sending out its heat upward towards the atmosphere. The atmosphere and the molecules in it absorb some of that heat and send it back. That’s actually the greenhouse effect
that’s responsible for climate change. But here’s the critical thing
to understand. Our atmosphere doesn’t absorb
all of that heat. If it did, we’d be
on a much warmer planet. At certain wavelengths, in particular between
eight and 13 microns, our atmosphere has what’s known
as a transmission window. This window allows some of the heat
that goes up as infrared light to effectively escape,
carrying away that pool’s heat. And it can escape to a place
that is much, much colder. The cold of this upper atmosphere and all the way out to outer space, which can be as cold
as minus 270 degrees Celsius, or minus 454 degrees Fahrenheit. So that pool of water is able
to send out more heat to the sky than the sky sends back to it. And because of that, the pool will cool down
below its surroundings’ temperature. This is an effect
known as night-sky cooling or radiative cooling. And it’s always been understood
by climate scientists and meteorologists as a very important natural phenomenon. When I came across all of this, it was towards the end
of my PhD at Stanford. And I was amazed by its apparent
simplicity as a cooling method, yet really puzzled. Why aren’t we making use of this? Now, scientists and engineers
had investigated this idea in previous decades. But there turned out to be
at least one big problem. It was called night-sky
cooling for a reason. Why? Well, it’s a little thing called the sun. So, for the surface
that’s doing the cooling, it needs to be able to face the sky. And during the middle of the day, when we might want
something cold the most, unfortunately, that means
you’re going to look up to the sun. And the sun heats most materials up enough to completely counteract
this cooling effect. My colleagues and I
spend a lot of our time thinking about how
we can structure materials at very small length scales such that they can do
new and useful things with light — length scales smaller
than the wavelength of light itself. Using insights from this field, known as nanophotonics
or metamaterials research, we realized that there might be a way
to make this possible during the day for the first time. To do this, I designed
a multilayer optical material shown here in a microscope image. It’s more than 40 times thinner
than a typical human hair. And it’s able to do
two things simultaneously. First, it sends its heat out precisely where our atmosphere
lets that heat out the best. We targeted the window to space. The second thing it does
is it avoids getting heated up by the sun. It’s a very good mirror to sunlight. The first time I tested this
was on a rooftop in Stanford that I’m showing you right here. I left the device out for a little while, and I walked up to it after a few minutes, and within seconds, I knew it was working. How? I touched it, and it felt cold. (Applause) Just to emphasize how weird
and counterintuitive this is: this material and others like it will get colder when we take them
out of the shade, even though the sun is shining on it. I’m showing you data here
from our very first experiment, where that material stayed
more than five degrees Celsius, or nine degrees Fahrenheit, colder
than the air temperature, even though the sun
was shining directly on it. The manufacturing method we used
to actually make this material already exists at large volume scales. So I was really excited, because not only
do we make something cool, but we might actually have the opportunity
to do something real and make it useful. That brings me to the next big question. How do you actually
save energy with this idea? Well, we believe the most direct way
to save energy with this technology is as an efficiency boost for today’s air-conditioning
and refrigeration systems. To do this, we’ve built
fluid cooling panels, like the ones shown right here. These panels have a similar shape
to solar water heaters, except they do the opposite —
they cool the water, passively, using our specialized material. These panels can then
be integrated with a component almost every cooling system has,
called a condenser, to improve the system’s
underlying efficiency. Our start-up, SkyCool Systems, has recently completed a field trial
in Davis, California, shown right here. In that demonstration, we showed that we could actually
improve the efficiency of that cooling system
as much as 12 percent in the field. Over the next year or two, I’m super excited to see this go
to its first commercial-scale pilots in both the air conditioning
and refrigeration space. In the future, we might be able
to integrate these kinds of panels with higher efficiency
building cooling systems to reduce their energy
usage by two-thirds. And eventually, we might actually
be able to build a cooling system that requires no electricity input at all. As a first step towards that, my colleagues at Stanford and I have shown that you could
actually maintain something more than 42 degrees Celsius
below the air temperature with better engineering. Thank you. (Applause) So just imagine that — something that is below freezing
on a hot summer’s day. So, while I’m very excited
about all we can do for cooling, and I think there’s a lot yet to be done, as a scientist, I’m also drawn
to a more profound opportunity that I believe this work highlights. We can use the cold darkness of space to improve the efficiency of every energy-related
process here on earth. One such process
I’d like to highlight are solar cells. They heat up under the sun and become less efficient
the hotter they are. In 2015, we showed that
with deliberate kinds of microstructures on top of a solar cell, we could take better advantage
of this cooling effect to maintain a solar cell passively
at a lower temperature. This allows the cell
to operate more efficiently. We’re probing these kinds
of opportunities further. We’re asking whether
we can use the cold of space to help us with water conservation. Or perhaps with off-grid scenarios. Perhaps we could even directly
generate power with this cold. There’s a large temperature difference
between us here on earth and the cold of space. That difference, at least conceptually, could be used to drive
something called a heat engine to generate electricity. Could we then make a nighttime
power-generation device that generates useful
amounts of electricity when solar cells don’t work? Could we generate light from darkness? Central to this ability
is being able to manage the thermal radiation
that’s all around us. We’re constantly bathed in infrared light; if we could bend it to our will, we could profoundly change
the flows of heat and energy that permeate around us every single day. This ability, coupled
with the cold darkness of space, points us to a future
where we, as a civilization, might be able to more intelligently manage
our thermal energy footprint at the very largest scales. As we confront climate change, I believe having
this ability in our toolkit will prove to be essential. So, the next time
you’re walking around outside, yes, do marvel at how the sun
is essential to life on earth itself, but don’t forget that the rest of the sky
has something to offer us as well. Thank you. (Applause)

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  • Reply GUM MY October 1, 2018 at 9:00 pm

    Thos could be used to power space ships in space

  • Reply Be the change October 3, 2018 at 12:23 am

    Dude, the ancients didn't make ice silly. They bought it at the convience store. Duh.
    Your invention is very cool btw…

  • Reply Hasan M October 9, 2018 at 4:43 am

    Best weapon against global warming

  • Reply Hasan M October 9, 2018 at 4:45 am

    Half of the audience didn't understand what cellcius meant

  • Reply join the conversation October 12, 2018 at 1:05 am

    This is VERY interesting! hope that it works!

  • Reply Keith Reynolds October 15, 2018 at 10:18 pm

    Very good mirrors….. Wondering if it could make up the mirrors of a heliostat that concentrates solar rays for solar thermal energy, then a heat engine does work as the energy flows back to the panels in a heliostat that radiates it out to space.

  • Reply ravi kang October 16, 2018 at 4:40 pm

    Can i get that sheet sir that you have mentioned in video
    Made from sio2 , Tio2… and soo
    What will be the cost for that sheet for 1 sq metre ?

  • Reply Yen Tao October 16, 2018 at 11:20 pm

    How about a conservatory or balcony covered with this material? Air within can also radiate heat. Maybe not as efficient but much simpler and cheaper.

  • Reply Nine year old. November 4, 2018 at 2:25 pm

    There should be a way of combining this technology with the technology of Nitinol Metal reaction.

  • Reply Vishva Kumara November 7, 2018 at 11:28 am

    This is the coolest TED talk.!

  • Reply G. Dave3 November 9, 2018 at 6:02 pm

    Totally Amazing, an area of energy capture I’ve never heard about!. The potential for this technology is massive, the idea of using the cold of space to release earths heat if done on large scale could actually help cool the earth, like heat pumps they use what we already have as apposed to combusting more stuff!.

  • Reply kelly bush November 13, 2018 at 5:56 am

    What about an umbrella that creates a micro climate under it, for hot days.

  • Reply GrrMeister November 24, 2018 at 11:59 pm

    We don't need COLD we need HEAT !
    Note that 'Air Conditioning Units' can be an efficient means of Heating.

  • Reply Gideon Schwalbe November 30, 2018 at 7:22 am

    better start thinkifng about outer space warming and its issues already ^^

  • Reply Free MGTOW December 15, 2018 at 8:54 pm

    This man is a Genius. Give him all the Research Money please.

  • Reply Jack Liu January 1, 2019 at 5:30 am

    Great speech!

  • Reply GaunletofDestruction January 7, 2019 at 9:05 am

    The man that invented this technology should get in touch with The X-Prize Foundation, Bill and Melinda Gates Foundation and Elon Musk! It could go much further! It has so much potential!!

  • Reply Henri de Feraudy January 24, 2019 at 1:33 pm

    It seems that this technology is expensive. A technology that is similar but much cheaper has been invented.

  • Reply leo1300177 January 28, 2019 at 1:54 am

    I hope to see this material to be used to run the Stirling engine in the future, to turn our environment heat energy into electrical energy!

  • Reply Wemdiculous February 1, 2019 at 2:27 am

    But why wouldn’t you just wrap a blackbody around a pipe… and put a long skinny solar cell between the sun and the blackbody attached to 2 struts and a counterbalance… then run coolant through the pipe? You can scale that to w/e size you want with no research by tomorrow… hint: the longer your struts the more sky your blackbody can see.

  • Reply Moldy Carrot February 19, 2019 at 11:11 am

    Cool. But space isn't actually cold, space is nothing.

  • Reply Bucket List March 10, 2019 at 2:29 am

    If we make light and heat from cold and dark, how does that fit with the laws of thermodynamics? Wouldn't that be creating energy from nothing, effectively?

  • Reply Oboy Phan March 11, 2019 at 10:14 am

    Cooler inside EARTH

  • Reply mwngw March 13, 2019 at 5:31 am

    Very, very exciting.

  • Reply Dyson Golf March 14, 2019 at 4:27 pm

    Outstanding presentation!!!!  Let's get it Aaswath!!!

  • Reply Aaron H March 22, 2019 at 11:04 pm

    We just need to keep the artic cool, using this method l?

  • Reply jagtan13 April 9, 2019 at 3:44 am

    To anyone that suffered through that hot summer day in Northridge CA when the substation blew up. The heat trapped by the evening clouds was the heat from the ground that was reradiated to it. I've thought of the system and how it work. Here we are simply tapping into another of the three forms of heat teansfer. From conduction, convection and in this case radiation. This's cool stuff.

  • Reply PikPobedy April 9, 2019 at 3:05 pm

    Any potential difference is potentially an energy source.

  • Reply Dewadatta Avasare April 13, 2019 at 2:15 pm

    Then why aren't we doing it?

  • Reply Dewadatta Avasare April 13, 2019 at 2:28 pm

    It's a great idea but isn't hafnium a rare element

  • Reply Robert Dsouza April 20, 2019 at 2:16 am

    Great innovation ,if becomes reality ,will change people live their lives

  • Reply Good ol' Joe May 10, 2019 at 3:13 pm

    This man stinks bullshit.

  • Reply dave angel May 19, 2019 at 9:51 am

    Warm it up ffs

  • Reply Sperm Heli June 10, 2019 at 8:50 am

    Did he try experiment to make ice like the ancient?
    Did he proved that it is ice making structure?
    Did he proved that ancient making ice by transfering heat into outer space?
    How did the ancient transfer heat by infrared from pool into the outer space?

    Sorry just curious.
    Please share me any video to make ice by transfering heat into the outer space. I really need it.

  • Reply Macmacoy Tot June 10, 2019 at 2:47 pm

    This is the third time I saw this video. first two were when I was onboard Qatar Airways. Mankind should immediately do something to materialize this.

  • Reply Henry Wijaya June 27, 2019 at 10:09 am

    Make solar panel and that thing in combo hot solar panel,absolute zero space+power from solar panel

  • Reply Moonette Wolfsong June 30, 2019 at 8:07 am

    The instant he said ‘imagine something being cooler when you take it out of the shade’ and I just thought, imagine that in clothing. Imagine not being trapped inside by heat in a world that is so hot it’s inhabitable without assistance in some areas, which is where the earth may end up being. Living underground, in the sides of caves, earth ships etc is one thing, but the ability to make it portable? Or just taking ‘passive’ cooling to a whole new level, when looking at the heat on the tops of cars and the sides of skyscrapers and imagining them staying cool instead.

  • Reply 75hilmar July 5, 2019 at 5:56 pm

    Leaving the fridge open ist stupid because the heat from the back will eliminate the cold from the front and in the end it will heat up because it uses energy in the process. Conventional ACs are just AS stupid and In really hope people will realise that.

  • Reply V July 10, 2019 at 3:33 pm

    Thumb’s up!!

  • Reply NICEFINENEWROBOT July 12, 2019 at 1:48 am

    Is space cold? Is darkness cold, is vacuum cold? Emitting infrared light into the "void" is not the same as moving heat down a gradient to zero temperature. Space is neither cold nor hot.
    Daedalus has had this solution some time ago. Read "The Inventions of Daedalus (1982)" by David Edward Hugh Jones. Aaswath Raman inserts his solution with the nano structures he developed. That is the new thing.
    "could lead us towards a future where we intelligently tap into the energy of the universe" – that's pretty big talking.

  • Reply Khong Minh July 12, 2019 at 6:21 pm

    This is brilliant

  • Reply Hussain Mirahmadi July 14, 2019 at 7:10 am

    One of the best TED talks (if not the best) I've ever watched .

  • Reply Jay Paans July 17, 2019 at 11:31 am

    This is really cool! Build this. Use this. Today. Please? 🙂

  • Reply Rachel July 22, 2019 at 2:59 am

    This is so cool!
    (Pun intended lol)

  • Reply david whitaker July 22, 2019 at 9:56 pm

    excellent exploration ane presentation I am working an idea of green power generation generation in orbital generators i would like to fowad to you after I complete draft [email protected]

  • Reply Phil Ellis July 25, 2019 at 10:19 pm

    I have the distinct opportunity to find early adopters in the So Cal region to use this product. What an honor! What an amazing product!

  • Reply vazvaz voova July 28, 2019 at 8:14 am

    You think 30°C is hot?
    Saudi 40° on a good day.
    A Good Day!
    Reaches 50° sometimes..
    Actually 30° is pretty nice if I'm honest.

  • Reply 101m4n July 29, 2019 at 12:07 am

    Not sure about the power generation thing.
    We are already in a situation where our power requirements are coupled to temperature (greenhouse effect). If we rely too heavily on this space-cooling effect, we'll reduce earths albedo and end up in the same situation, just in the opposite direction. Ideally what we need are ways to generate power that have no effect on the environment whatsoever.
    The cooling potential is awesome though 🙂

  • Reply Joannot July 29, 2019 at 3:06 pm

    And ⬆ this ⬆ is how you change the world.

  • Reply SJ H August 5, 2019 at 9:39 pm

    In 150 years, tech like this could mean the difference between life or death for millions of people. Seriously. There are no straight silver bullets for solving climate change beyond changing the meaning of the word "civilization" and all that implies. But there are smaller technofixes for the individual problems, and this is one of the best I've ever seen. This can't get enough attention.

  • Reply phaelax August 6, 2019 at 6:03 pm

    If we send this tech to elon musk, maybe he'll make a freeze ray!

  • Reply Simi Hanniel August 10, 2019 at 6:10 am

    So, basically, you've study books into the annals of multimillionaire.

  • Reply Christoph K. August 10, 2019 at 4:01 pm

    I'm not sure but wouldn't that increase back radiation due to greenhouse gases so that energy can't really escape into space?

  • Reply Masteracci August 13, 2019 at 1:44 am

    – TED?
    – Yes

    – Good Luck!

  • Reply Hugo Stiglitz August 17, 2019 at 10:37 am

    If you made your clothes out of this material it would have a health warning, WARNING, NOT SUITABLE FOR OUTDOOR USE!😄

  • Reply vik hellrider August 24, 2019 at 10:05 pm

    This guy is a fucking genius

  • Reply Abhik Sarkar September 18, 2019 at 7:47 am

    This looks really promising! I hope we will hear more about it and that the startup gets enough funding to continue its important mission.

  • Reply Blain Evans September 25, 2019 at 11:56 pm

    So if you used this in a STEG in reverse at night then rotated it on a pivot for daytime heat-based power generation? *24 hour power*?

  • Reply Andras Joo October 7, 2019 at 7:48 am

    fck yes guys, fck yes!! ❤🏆🌍

  • Reply Steven Coffey October 12, 2019 at 7:07 pm

    I wonder if/how life, particularly plants have used controlled radiating of infrared to space to make themselves more comfortable.

  • Reply 님할말 없음 October 13, 2019 at 8:49 am

    I think the idea of using the heat energy around us to send heat into space is a technology that will be used for the future of mankind through the fusion of other technologies. But the heat produced by these technologies  used in air conditioning  for human comfort, it seems to have many other drawbacks, such as the destruction of the environment.  So I think we need to think a lot about how we can overcome these drawbacks.

  • Reply 김아치 October 14, 2019 at 1:02 pm

    It makes me think global warming about any problems and we can, should reduce global warming about heat energy. Also  an old people use a point of view about water is surprising. So i think people should develop heat technology about energy

  • Reply 레온하르트오일러 October 15, 2019 at 2:05 am

    It is thought that the future of scientific civilization is characterized by being able to utilize all energy without wasting it. I believe your efforts will pave the way for a future scientific civilization. And I want to further support and nurture creative talents like you. Cheer up

  • Reply JackyVivid October 15, 2019 at 6:46 pm

    This summer the highest temp recorded was 47 C (116.6F) in my place. We don't have Air conditioning.

  • Reply Killerean October 16, 2019 at 3:17 pm

    Correction: There's no cold in space. There's just nothing to reflect the heat back.

    Otherwise: Cool. Literally.

  • Reply 바버 October 17, 2019 at 1:47 pm

    In today's world, it's important that the future of science be reused without wasting a lot of energy. In that sense, I think this lecture will be important for progress in the future. Thank you for giving me this lecture, and I hope many people will know.

  • Reply 강려원 October 17, 2019 at 1:58 pm

    1) Causes of global warming
    The Earth is suffering from global warming, which is getting wArmer every year. The scourge of global warming is caused by environmental damage to people. So we have to be wiling to protect the environment, and try to do the little things in our lives to stop global warming.

  • Reply 김성민 October 17, 2019 at 3:09 pm

    I was curious about the nano photonic radiative cooler.It's about whether the nano photonic radiative cooler is useful on rainy days.
    If the nano photonic radiative cooler is useless on rainy days, hot and rainy places will not be practical.And I wonder if the cost of the nano photonic radiative cooler is also practical.

    nano photonic radiative cooler If is too expensive, it will be difficult for anyone to use.

  • Reply 전효진 October 17, 2019 at 3:16 pm

    We use a lot of energy and deepen global warming just for the sake of our convenience or happiness now without any thought. Perhaps everyone knows that global warming is a culprit. But we've only told us to use it less to reduce it, and haven't thought about how to replace it with anything else. By watching this video, It seemed to me that I thought that I should think about ways to protect the earth together like a video.

  • Reply 이현석 October 17, 2019 at 3:17 pm

    This is very unique way. I couldn't think about them. I think that renewable energy is only exist in the earth. I hope that the energy we get from outer space will help us. ^^

  • Reply 최윤서 October 17, 2019 at 9:25 pm

    We use air conditioning machines and use a lot of energy even when it's a little hot. These air-conditioning systems emit 8 percent of the world's greenhouse gases, a small number at first glance, but I think they are a huge number that will one day bring disaster and blow to the Earth. It also learned that the influence of all elements in the sky, as well as the sun, was important and that the atmosphere did not absorb all the heat transferred. In this video, I will think about ways to protect the Earth from global warming like this scientist.

  • Reply 봉종인 October 17, 2019 at 10:57 pm

    It was amazing to know the new concept of radiant cooling and cheer for the creation of a cooling system that requires no power supply at all

  • Reply 김도현 October 18, 2019 at 1:03 am

    Wow that's amazing!!!!
    I can understand that all^^
    Thank you very much~~

  • Reply 오영우 October 18, 2019 at 2:13 am

    When I heard the explanation of renewables using cold characteristics of space, I thought it would be very beneficial, and I hoped that a realizable day would come soon.

  • Reply 이연호 October 18, 2019 at 2:13 am

    I understand this video. And I interested this video. Thank you very much. I love this video.

  • Reply 김도현 October 18, 2019 at 3:02 am

    It's amazing how renewable energy uses the cold nature of space!!
    So, we're very interested in sustainable energy.
    Thank you very much.

  • Reply 노대영 October 18, 2019 at 3:11 am

    I learned about renewable energy using cold characteristics of space after watching this video. It's amazing and amazing.

  • Reply 김유림 October 18, 2019 at 6:03 am

    Global warming is causing climate change and wreaking havoc on the ecosystem. If we use wasted energy to increase efficiency in a situation where global warming is getting worse, we will be able to reduce global warming in the near future.

  • Reply Iamadlc HorM October 18, 2019 at 6:46 am

    material that gets cold when heated by the sun

  • Reply Iamadlc HorM October 18, 2019 at 6:49 am

    You know this guy is going to be on the History Book.

  • Reply 예원진 October 18, 2019 at 9:21 am

    I realized that energy and electricity consumption is increasing not only in Korea but also in the world, and I also learned that energy can be produced and used in various eco-friendly ways.

  • Reply 강수형 October 18, 2019 at 11:15 am

    When we think about global warming, we just think "We should reduce our use of some appliances that emit carbon gas!". We even know the fact that the more we use air conditioner , the hotter the planet becomes though, we use them because we are hot! I think this is very irresponsible. We have to consider the children who will live in this planet after we die. As this point, I respect him so much because he moved his ideas into actions by inventing new materials. I can't do what he did, but I promise I'm gonna stop using some machines that cause global warming for next generation.

  • Reply 혜정오 October 18, 2019 at 11:45 am

    We all know that the Earth is currently suffering from global warming. We know this, but we're not trying to make even minor changes, such as reducing the use of air conditioning.

    The more we use air conditioning, the higher the temperature of the Earth.

    If the temperature goes up, we're going to use air-conditioning machines.

    This vicious cycle makes our planet painful.

    And in the end, it does a lot of damage to us.

    In order not to create these nightmares, we all have to change for the Earth, one for each of us.

    If we recognize the seriousness of the problem, if we work hard with the right mindset, can we pass on a sustainable environment to our children in the future?

    Let's try our best slowly and steadily.

  • Reply 김동욱 October 18, 2019 at 12:55 pm

    How do people think this surprising idea?
    As we've developed with a lot of wonderful science technology, we will go to better world.
    One of them is a video. The idea that using space to reduce global warming surprised me.
    I always believe that though Science makes many troubles, but these troubles only can be solved by Science
    So I want to be a great scientist and make the world comfortable.

  • Reply 한희만 October 18, 2019 at 1:29 pm

    I was surprised to see that air conditioning is now 7% more than electricity, but in 2050 I was even more surprised to see that it uses six times as much electricity as it is today.

  • Reply 최윤영 October 18, 2019 at 1:33 pm

    The current cooling system is increasingly used around us, and it causes global warming. It's ironic that we're going to raise the temperature to lower it. I thought the Nano-photonic Radiative Cooler could stop this. Also, If we could develop more Nano-photonic Radiative Cooler, I thought we could make a product that can be applied to clothes that people wear in real life, give them coolness, apply them to cosmetics, and block UV rays more effectively.

  • Reply 강동규 October 18, 2019 at 1:41 pm

    Looking at this video, I was surprised that the focus of many of the reasons for global warming was on air conditioning, and that by improving it, we could slow down global warming and thereby create a better future! My dream is to be an engineer, and using the science and technology in this video, I also thought I would like to improve my air conditioning system and contribute to global warming deterrence! Thank you for the good lecture!

  • Reply 쎙쏭 October 18, 2019 at 2:19 pm

    after watching this video, I am more surprised that global warming is significant problem we should solv. Also,  knowing that using air conditioner produces greenhouse gases,  I recognized that I have to try to diminish use of air conditioner. I want to be a scientist who plays a big role in energy development in the future. Solving environmental problems is a difficult task, but I want to constantly study science and help solve environmental problems

  • Reply 이지민 October 18, 2019 at 2:31 pm

    It is amazing that refrigeration accounts for 17% of the world's electricity consumption. But it's also amazing that we can replace it with a cooling principle, but we're disappointed that we can't use it because of the sun. And I was surprised. That he built a panel and used the cooling principle.

  • Reply 지수 October 18, 2019 at 2:44 pm

    It seems to be a very good idea and invention. I'd like to try later on such an invention.

  • Reply y03p s October 18, 2019 at 2:47 pm

    I am shocked that cooling system we created to stay cool in summer ended up being the cause of greenhouse gas at the end of the 21st century. So I decided I don't often use cooling system in summer.

  • Reply 부캐 October 18, 2019 at 2:49 pm

    It is very good to be able to live a healthy and happy life when using air conditioning facilities, but seeing that the future will require more than 10 trillion kWh of electricity, I hope to invent a technology to reduce the power consumption of air conditioning facilities.

  • Reply cho fha October 18, 2019 at 2:55 pm

    I wondered how I would make and eat ice when there was no refrigerator in the hot area. But after watching this video, I got rid of my curiosity. It's amazing that water freezes at a temperature higher than freezing point. I hope they can succeed in researching technology using this principle.

  • Reply 유현정 October 18, 2019 at 2:59 pm

    It was shocking that Asian and African countries were responsible for the greenhouse gas emissions of air-conditioning machines. And for example, yakchal was amazing and impressive. I didn't think about the space-based cooling system, but it was good this time, and I thought other regenerators should be more interested in alternative energy sources.

  • Reply 서경희 October 27, 2019 at 8:36 am

    The use of air-conditioning devices has increased the temperature of the atmosphere, causing various problems for the earth we live in. We have come to think for ourselves how to overcome and solve this problem. In the real world we live in, we have no choice but to use energy according to climate and environment. The more heat energy you use, the more proportional the air temperature. How can we overcome it?
    First, heat efficiency should be increased more than it is now.
    To this end, technological development is essential.
    Second, we need to find and develop eco-friendly energy. We still have to work in untapped areas such as obtaining hydrogen energy from water, using it for living, and getting energy from protons.
    Third, fossil fuels do not use as much as possible and use natural energy well. I should develop and make the most of the energy that can be obtained from nature, such as solar energy, water power energy, wind energy, etc.
    As such, we felt that we would have to make great efforts to make a solution to the rising atmospheric temperatures by using energy and that we would have to save energy ourselves.

  • Reply 이름 October 27, 2019 at 12:34 pm

    Watching this video, I came to look back on myself. I found out how relevant global warming is to the use of air conditioners and others that I have never thought about I'm surprised that small scientific discoveries have a big impact. I should also try to make a better future planet.

  • Reply 이다희 October 27, 2019 at 12:52 pm

    Using the phenomenon of night sky cooling, there is no power.
    The idea of sending hot heat into cold outer space is really fresh, and I want to applaud SkyCool's efforts to create a sustainable cooling system by worrying about environmental problems due to climate change.I also want to participate in sustainable energy development and actively participate in the development of new materials that are environmentally I've been able to realize how painful our planet has been and how serious it is, and I hope everyone realizes that.

  • Reply thesourkroutkid October 31, 2019 at 5:28 pm

    We can make electricity from winter cold an summer heat

  • Reply Sayan Hazra November 6, 2019 at 2:22 pm

    What was the material?

  • Reply Nova Verse November 9, 2019 at 12:32 am


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