We'd never have got a chance to go outside and look at the earth if it hadn't been for space exploration and NASA.

The oil companies regard nuclear power as their rival, who will reduce their profits, so they put out a lot of disinformation about nuclear power.

The tropical rain forests are a telling example. Once cut down, they rarely recover. Rainfall drops, deserts spread, the climate warms.

An inefficient virus kills its host. A clever virus stays with it.

Humans are too stupid to prevent climate change from radically impacting on our lives over the coming decades.

You never know with politicians what they are really saying. And I don't say that in a negative way-they have an appalling job.

There aren't just bad people that commit genocide; we are all capable of it. It's our evolutionary history.