Concentration of greenhouse gases, especially CO2, have increased substantially since the beginning of the industrial revolution. And the National Academy of Sciences indicates that the increase is due in large part to human activity.

American mission in Iraq is clear: We're hunting down the terrorists. We're helping Iraqis build a free nation that is an ally in the war on terror. We're advancing freedom in the broader Middle East. We are removing a source of violence and instability and laying the foundation of peace for our children and our grandchildren.

I'm joyful in my religious belief.

Here in the United States our Muslim citizens are making many contributions in business, science and law, medicine and education, and in other fields...[they are]upholding our nation's ideals of liberty and justice in a world at peace.

I understand everybody in this country doesn't agree with the decisions I've made. And I made some tough decisions. But people know where I stand.

Let me start off by saying that in 2000 I said, 'Vote for me. I'm an agent of change.' In 2004, I said, 'I'm not interested in change - I want to continue as president.' Every candidate has got to say 'change.' That's what the American people expect.

I got a lot of Ph.D.-types and smart people around me who come into the Oval Office and say, 'Mr. President, here's what's on my mind.' And I listen carefully to their advice. But having gathered the device, I decide, you know, I say, 'This is what we're going to do.'