I was much more of a naïve techno-optimist than I am now. I still believe that technology can help us come out of this situation with a richer humani….

Agriculture is the #1 source of deforestation. By some estimates it accounts for 80% of the forests chopped down in the tropics..

I think the environmental movement is now so large and diverse that it's hard to talk of it as a single entity..

Unfortunately, in the environment, I don't see as much willingness to invest heavily in R&D as I do in consumer technology. And that's a pity..

You have to be able to generate usable energy without greenhouse gas emissions and you have to be able to do it cheaply if you want people to choose ….

We don't have good global policies in place for climate..

There are really two kinds of optimism. There's the complacent, Pollyanna optimism that says "don't worry - everything will be just fine" and that al….

On almost every environmental issue I care about, in fact, I've been wrong at one point or another. I used to think that climate change was no big de….

We have climate change caused by greenhouse gas emissions, mostly from human power and transportation infrastructure. At the same time, we have 2 bil….

Often we need to use policy to level the playing field, or to be sure that a technology is managed in a responsible way..