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Cells on top of each other we call multi—junctions, and the simplest multi—junction is a tandem cell, two solar cells on top of each other. and the perovskite we tune to match perfectly silicon. it absorbs only the visible light and we let the silicon absorb all the infrared. and in doing that we actually fundamentally improve the efficiencies. if we made a perfect perovskite on silicon tandem cell, that would top out at about 45%. so weve fundamentally lifted the ceiling. and if we went one...

So we are now going to go to scotland, to alastair, who has a question about nuclear energy. alastair? hello, today weve got representatives of wind and solar, which are often portrayed as the two examples of clean energy. but there are still huge challenges with the amount of land required and energy storage required — challenges which arent faced by existing nuclear power technology, something i would argue we really need to prioritise. i wonder if you think nuclear should form a key part of...

Deployed in the world. so this is all fantastic, this is state—of—the—art technology and engineering that is market ready or nearly market ready. so is the message that i should get that you are going to gallop to my rescue when it comes to climate change? that i can carry on with my life as i always have, and everything is going to be fine, because the engineers are going to sort it all out? henry, i want to start with you. is that what i should be taking away from this? that is not what ...

Energy as unacceptable. - we cant waste energy in any form of action. i so when the energy is going to be challenging to harvest _ at large—scale, were solving parts of harvesting as much energy- as we can in good ways, _ and then we have to use that energy as efficiently as possible. and before we open it up to questions, danielle, when it comes to the threat that climate change presents to us, who is going to do the heavy lifting? is it going to be the engineering or is it going to be the in...

And we let the silicon absorb all the infrared. and in doing that we actually fundamentally improve the efficiencies. if we made a perfect perovskite on silicon tandem cell, that would top out at about 45%. so weve fundamentally lifted the ceiling. and if we went one step further to anotherjunction, triple junction, three junctions, that would top out at just above 50%. so what perovskite does is lift the ceiling for potential efficiency and gives us a new path forward to go to higher and higher...

For birds are known, and we dont site wind turbines in those areas or wind farms in that space. but there cantjust be a wholesale rejection of this technology because of the threat of something that would be negative. that collaboration is the real opportunity for us to work together. so its a partnership, really, its you delivering the technologies that make the future possible, and us adopting them and making the right choices to protect us from this growing threat. thank you so much. were goi...

Hi, my name is shivika from imperial college. i just want to know about the future regarding the airborne wind turbines. what do you think that in the near term there is a future for airborne because google investing in airborne wind turbine system, weve already seen one — first wind turbine system in germany. so what is the future of that technology? so, weve had land, weve had sea and now were asking about air turbines. im fascinated to hear the answer to this. for those who havent heard abo...

The technologys there, but if it doesnt get employed and deployed, then its not going to work. thank you. kristian? i think accepting what is happening on that side, | as henry mentions, is crucial. and then an aspect that. i would emphasise as well is that we have to look at wasting energy - as unacceptable. we cant waste energy in any form of action. i so when the energy is. going to be challenging to harvest at large—scale, were solving parts - of harvesting as much energy as we can in good...

Cells on top of each other we call multi—junctions, and the simplest multi—junction is a tandem cell, two solar cells on top of each other. and the perovskite we tune to match perfectly silicon. it absorbs only the visible light and we let the silicon absorb all the infrared. and in doing that we actually fundamentally improve the efficiencies. if we made a perfect perovskite on silicon tandem cell, that would top out at about 45%. so weve fundamentally lifted the ceiling. and if we went one...

Out in the world, itd be 24% reduction in cost. and as you continue to see volume increase in these technologies you will continue to see cost reduction. thank you so much, danielle. so we are now going to go to scotland, to alastair, who has a question about nuclear energy. alastair? hello, today weve got representatives of wind and solar, which are often portrayed as the two examples of clean energy. but there are still huge challenges with the amount of land required and energy storage requir...