hello, i'm kevin fong, and welcome to the engineers: clean energy.are here at the victoria and albert museum in london with a socially distanced public audience, a virtual audience from around the globe, and three of the world's leading engineers. now, the climate catastrophe threatens all of us. but these engineers are at the forefront of providing our world with real solutions. applause. please welcome henry snaith. he's professor of physics at oxford, and through his engineering of low—cost photovoltaics, henry discovered a thin film of solar cells made of perovskite. it could be a hugely significant discovery, as henry hopes it will eventually double the efficiency of solar power and halve the cost. danielle merfeld is an electrical engineer who is chief technology officer and vice—president of ge renewables. ge is the biggest creator of wind turbines worldwide, and she and her team currently have over 40,000 wind turbines out in the field. she'sjoining us by video link from north carolina, usa. kristian eikeland holmefjord is here from norway af