I've always been more interested in organisms that can move on their own than in stationary plants. But when I canoe or hike along the edge of lakes or oceans and see trees that seem to be growing out of rock faces, I am blown away. How do they do it?

The failure of world leaders to act on the critical issue of global warming is often blamed on economic considerations.

The future doesn't exist. The only thing that exists is now and our memory of what happened in the past. But because we invented the idea of a future, we're the only animal that realized we can affect the future by what we do today.

If America wants to retain its position as a global power, its president must listen to the people and show strong leadership at this turning point in human history.

The climate is changing. That's not the debate. The debate is how do we know what the ideal surface temperature is in 2100?

As far as I understand, the Second Coming is already here. It's a consciousness. It is not someone who is going to arrive and land in a clearing in the forest. The Hell that they talk of is going to be people creating their own unhappiness, a Hell on Earth.

Our Committee should be focusing on real priorities - improving health care, combating climate change, creating jobs and making products safer - not attacking Planned Parenthood and undermining women's access to critical services.

If we don't succeed on the climate change agenda, we risk getting feedbacks that undermine everything else.