Barack Obama: “We have a responsibility to protect the health of our economy and environment.”

I think when we act on that basis, it doesn't always work out, but over time things do get better.

I’m going to insist that we can do better than we’re doing right now.

When we choose, when we make that decision, I do believe – and there is evidence for this – that the world gets incrementally better, and that is a worthy goal and it’s worth fighting for.

And I will fight for that, even if I don’t always think it’s going to win.