As I have said for many years throughout this land, we're borrowing money from China to buy oil from the Persian Gulf to burn it in ways that destroy the future of human civilization. Every bit of that has to change.

I think that we should ban so-called junk guns. I think we should ban assault weapons like the weapons used here [in Fort Worth], yes. I think that the kinds of weapons that have no legitimate use for hunting or the kind of weapon that a homeowner would use, I think they should be banned, yes, those kind of weapons.

...the emergent capabilities bursting forth from the revolutionary advances in the life sciences are about to make us the principal agent of evolution.

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

Junkies find veins in their toes when the veins in their arms collapse. Developing tars sands is the equivalent.

I have faith in the United States and our ability to make good decisions based on the facts.

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