Successful movements also need an organisational model that allows them to keep growing.

I might find myself standing, transfixed, by the roadside, watching a sparrowhawk hunting among the bushes, astonished that other people could ignore it. But they might just as well be wondering how I could have failed to notice the new V6 Pentastar Sahara that just drove past.

Immense wealth translates automatically into immense environmental impacts, regardless of the intentions of those who possess it.

Places that have become agricultural deserts, trashed by giant corporations, could be reforested, drawing carbon dioxide from the air on a vast scale. The ecosystems of land and sea could recover, not just in pockets but across great tracts of the planet.

I don't know that a political climate - as long as it's still a free country - makes much difference in the film world.

There's something outrageously funny about the bold-faced lying that's going on, in a general way. Just the blatant denial of facts, whether it's climate change or crowd sizes. Every day, there's another blatant lie. I think there's comedy in there somewhere.

Scientists worldwide agree that the reduction needed to stabilize the climate is actually more like 80 percent.

We are entering an era of heightened disaster, thanks to climate change. Being prepared for disaster will mean being prepared to sift truth from rumour, and being prepared to adjust our worldview.