Perhaps the single most important thing that we can do to undo the harm we have done is to fix firmly in our minds the thought: the earth is alive.

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.

So-called 'sustainable development' is meaningless drivel.

For each of our actions there are only consequences.

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.

Geological change usually takes thousands of years to happen but we are seeing the climate changing not just in our lifetimes but also year by year.

Humans on the Earth behave in some ways like a pathogenic micro-organism, or like the cells of a tumor.