Greenhouse gas pollution, through its contribution to global climate change, presents a significant threat to Americans' health and to the environment upon which our economy and security depends.

I definitely challenge people. But hopefully, I am working harder than anybody else, and so people won’t resent the fact that I want them to work hard, as well.

I love disagreements. I love the democratic process. If I’m in a room where everybody agrees, I start to nod off.

Even if there’s controversy, I’m going to make the decision, and people are going to be happy in one instance and unhappy in the next. But that’s the job I’ve been given and the job I’m going to embrace.

The EPA’s greenhouse gas regulations, along with a host of other onerous regulations, are unnecessarily driving out conventional fuels as part of America’s energy mix. The consequences are higher energy prices for families and a contraction of our nation’s economic growth.

I cannot shy away from controversy. I don’t know if it’s my Irish blood, but I love it.

The challenges are large and we have to work together.

Critics play a dangerous game when they denounce the science and law EPA has used to defend clean air for more than 40 years. The American people know better.

But I will tell you that I didn't go to Washington to sit around and wait for Congressional action. Never done that before, and don't plan to in the future,

Climate change is the greatest threat of our time.