Our overriding environmental challenge tonight is the worldwide problem of climate change, global warming, the gathering crisis that requires worldwide action.

Sometimes I feel like the fire hydrant looking at a pack of dogs.

Simply put, unsustainable debt is helping to keep too many poor countries and poor people in poverty.

I think it's very important, and I think that what young people will learn from my experience is that even presidents have to do that and there are consequences when you don't. But I also think that there will be a box score, and there will be that one negative, and then there will be the hundreds and hundreds and hundreds of times when the record will show that I did not abuse my authority as president, that I was truthful with the American people.

We know that when we protect our oceans we're protecting our future.

I fully share the Congress's objective of promoting nonproliferation and combating Iran's efforts to acquire weapons of mass destruction (WMD) and missile delivery systems. This issue remains at the top of the agenda with Russia as well as with other countries whose companies may be providing such assistance to Iran. In the case of Russian entities' cooperation with Iran, we have imposed penalties ten times in the past and stand ready to apply them again whenever necessary.

Through scientific discovery and technological innovation, we enlist the forces of the natural world to solve many of the uniquely human problems we face - feeding and providing energy to agrowing population, improving human health, taking responsibility for protecting the environment and the global ecosystem, and ensuring our own Nation's security. Scientific discoveries inspire and enrich us, teaching us about the mysteries of life and the nature of the world.