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

In the food case in particular, one of the technologies that could help there - genetic technologies that could create better crops with higher yields and less need for water and fertilizer - is tremendously feared. Very little of that fear is scientifically grounded.

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

The more widely you can spread this notion of achieving ROI by preserving and improving ecosystems, the better.

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

Ozone and climate are global issues, and it's hard to find a way in which the benefits of shutting down carbon emissions are going to pay for themselves for any given power-plant, say.

That, to me, is a kind of brilliant environmental ju-jitsu - using the energy of the market and the profit-motive to get businesses to invest in preserving and improving natural systems.