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I have been very encouraged by President Obama's call to action on climate change both at his Inauguration and in the State of the Union Address. This is a global imperative. I also welcome President Obama's intention to pursue reductions in nuclear arsenals.

We must start to treat climate change as what it is - a threat to United States security. And we must not delay.

Addressing climate change and positioning the United States as the leader in advanced energy should be a top priority for our country and our economy, and I applaud the Obama administration for the steps it is taking.

A knowledgeable and courageous U.S. president could help enormously in leading the world's nations toward saving the climate.

The first sign of whether Obama is serious about confronting the climate crisis will be revealed by how he organizes the White House.

We can be thankful President Barack Obama is taking aim at one of the prime causes of climate change and extreme weather: air pollution. The EPA's carbon pollution standards are the most significant step forward our country has ever taken to protect our health by addressing climate change.

I want to use my position of leadership to help move along at a faster pace what I believe and know the Obama administration wants to do around the urgency of climate change.

Climate change was a point of division between Obama and Republican rival Mitt Romney. The president declared climate change a global threat, acknowledged that the actions of humanity were deepening the crisis, and pledged to do something about it if elected.

We have to wrap this imperative of addressing climate change in a prosperity framework, and secondly we have to do a much better job of putting forward an American jobs agenda that's a match for the climate challenge.