obviously not going to save the world by itself but 4% improvement in solar efficiency would be equivalent to 10s of millions of tons of CO2 reduction if this turns out to be scalable
Sorry to pick on something said in passing, but nothing saves the world by itself, nothing and nobody. People love to say, 'my vote [or whatever they do] won't change things'. Nobody can change things by themselves, yet things are changed enormously by people - how is that? :)