Our way of life is at stake, our grandchildren are at stake, the future of civilization is at stake.

The truth is that climate change is presenting the greatest challenge humanity has ever faced.

I flew on Air Force Two for eight years, and now I have to take off my shoes to get on an aeroplane.

A lot of people go straight from denial to despair without pausing in the middle and doing something about it.

CO2 is the exhaling breath of our civilization, literally... Changing that pattern requires a scope, a scale, a speed of change that is beyond what we have done in the past.

Now we have things that are obviously false, leading us to war, leading us to deny people health care, leading us to ignore the climate crisis. We have to restore the integrity of the democratic conversation.

Airplane travel is nature's way of making you look like your passport photo.