"Over a year ago I changed my diet to a vegan diet, really just to experiment to see what it was like. And I felt better, so I continued with it. Now, for many people, that choice is connected to environmental ethics and health issues and all that stuff, but I just wanted to try it to see what it was like. In a visceral way, I felt better, so I've continued with it and I'm likely to continue it for the rest of my life."

“The planet has a fever. If your baby has a fever, you go to the doctor. If the doctor says you need to intervene here, you don't say, 'Well, I read a science fiction novel that told me it's not a problem.' If the crib's on fire, you don't speculate that the baby is flame retardant. You take action.”

“These figures are fresh. Some of the models suggest to Dr. Maslowski that there is a 75 per cent chance that the entire north polar ice cap, during the summer months, could be completely ice-free within five to seven years.”

“Unilateralism, as we have painfully seen in Iraq, is its own reward. Going it alone may satisfy a political instinct but it is dangerous to our military, even without their Commander in Chief taunting terrorists to "bring it on.”

“During my service in the United States Congress, I took the initiative in creating the Internet.”

“There's an old African proverb that says "If you want to go quickly, go alone. If you want to go far, go together." We have to go far — quickly. And that means we have to quickly find a way to change the world's consciousness about exactly what we're facing, and why we have to work to solve it.”

“I believe it is appropriate to have an over-representation of factual presentations on how dangerous it is, as a predicate for opening up the audience to listen to what the solutions are, and how hopeful it is that we are going to solve this crisis.”