The symbolism - and the substantive significance - of planting a tree has universal power in every culture and every society on Earth, and it is a way for individual men, women and children to participate in creating solutions for the environmental crisis.

(George Bush) betrayed this country! He played on our fears. He took America on an ill-conceived foreign adventure dangerous to our troops, an adventure preordained and planned before 9/11 ever took place!

Americans have the right to have their medical decisions made by them and their doctors, and not by those bureaucrats sitting behind a computer screen hundreds of miles away.

Political will is a renewable resource, and everyone can have it in abundance if they so choose.

The oil industry has outpaced the building of a public consensus of the implications of climate science.

Anyone who deals with the climate crisis has an internal dialogue between hope and despair, because the challenge is so huge and the danger is so great and the stakes are so high. But I have always resolved that in favour of hope, and actually I'm more hopeful now than I was a decade ago when the solutions were visible on the horizon, but you had to seek reassurance that the technology experts that they're coming, they'll be here.

The scientific evidence of how serious this climate crisis is becoming continues to amass week after week after week.