[Alternative energy] will make us less dependent on foreign oil. It would make us more secure in our future. It would mean that our foreign policy could be a reflection of our values and our other interests, and not just that.

We have to change the whole job structure of America. We have got to basically reorient our economy toward the future.

Running helps me stay on an even keel and in an optimistic frame of mind.

As we have throughout this century, we will lead with the power of our example, but be prepared, when necessary, to make an example of our power.

I'm sorry, could you please tell me what the definition of the word "is" is?

The most profound security threat we face today is global warming....climate change has the capacity to change the way all of us live.

It is now conceivable that our children's children will know the term cancer only as a constellation of stars.