President Obama has offered a plan with 4 trillion dollars in debt reduction over a decade, with two and a half dollars of spending reductions for every one dollar of revenue increases, and tight controls on future spending. It's the kind of balanced approach proposed by the bipartisan Simpson-Bowles commission.

A significant number of petroleum geologists believe that we will reach the global maximum of petroleum extraction within this decade or that we have already reached it. Peak Oil happened in 1970 in America, when over half of our oil that we gained from the soil was exhausted ... This is very disturbing, regardless of global warming.

First, I worry about climate change. It's the only thing that I believe has the power to fundamentally end the march of civilization as we know it, and make a lot of the other efforts that we're making irrelevant and impossible.

If you believe in making change from the bottom up, if you believe the measure of change is how many people's lives are better, you know it's hard and some people think it's boring. Speeches like this are fun, actually doing the work is hard.

I did a lot of work on energy efficiency at the White House. By the time I left we had taken the equivalent of six hundred cars a year off the road in reduced greenhouse gas emissions just in the White House complex.

Presidents are not permitted to have personal feelings.

It is time to stop personal destruction and prying into private lives