There is a natural greenhouse effect that contributes to warming. Greenhouse gases trap heat and thus warm the Earth because they prevent a significant portion of infrared radiation from escaping into space.

The true history of my administration will be written 50 years from now, and you and I will not be around to see it.

The terrorists and their supporters declared war on the United States - and war is what they got.

I told you I'm not going to criticize my successor. I'll just tell you that there are people at Gitmo that will kill American people at a drop of a hat and I don't believe that persuasion isn't going to work. Therapy isn't going to cause terrorists to change their mind.

In the long run, stability cannot be purchased at the expense of liberty.

Throughout our history, the words of the Declaration have inspired immigrants from around the world to set sail to our shores. These immigrants have helped transform 13 small colonies into a great and growing nation of more than 300 people.

No president ever puts American lives at risk without a terrible sense of responsibility. And no American ever hears or reads of a soldier’s death without saying a silent prayer for the dead hero or thinking of the grief of the family and friends. Every young man or woman who dies represents a life with its own dreams and plans, extinguished so suddenly. But all said and done, it is our responsibility to see that (1) we never put our troops in situations where they are subject to unnecessary risk, and (2) we give them all our support at all times.