I've always wanted to come to Greece.

A low-carbon, clean energy economy can be an engine of growth for decades to come.

To look at long term trends in our economy, in our society, in the international sphere and using my best judgment, shape policies that will serve the American people, keep them safe, keep our economy growing, put people back to work.

As long as I'm president of the United States Iran will not get a nuclear weapon. I made that clear when I came into office.

You wouldn't know that if you talked to Human Rights Watch or Amnesty International or some of the international activist organizations. Certainly you wouldn't know that if you were talking to some of the writers who criticize our drone policy. But I've actually told my staff it's probably good that they stay critical of this policy, even though I think right now we're doing the best that we can in a dangerous world with terrorists who would gladly blow up a school bus full of American kids if they could.

The issue of climate change is one that we ignore at our own peril. There may still be disputes about exactly how much we're contributing to the warming of the earth's atmosphere and how much is naturally occurring, but what we can be scientifically certain of is that our continued use of fossil fuels is pushing us to a point of no return. And unless we free ourselves from a dependence on these fossil fuels and chart a new course on energy in this country, we are condemning future generations to global catastrophe.

Reflecting on his years in prison, Nelson Mandela wrote that there were dark moments that tested his faith in humanity, but he refused to give up.