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I believe that climate change represents one of the greatest threats to our national security and our planet.

We have to face the reality of climate change. It is arguably the biggest threat we are facing today.

Climate change is a very real threat right now to our economy, the future of our children, to our way of life.

Scientists have been warning about global warming for decades. It's too late to stop it now, but we can lessen its severity and impacts.

I think global warming is the gravest threat. With global warming, it's the product of a war between old energy - between the carbon cronies, who, by the way, could not stay in business in a true free market capitalism.

Climate change is a global problem. The planet is warming because of the growing level of greenhouse gas emissions from human activity. If this trend continues, truly catastrophic consequences are likely to ensue from rising sea levels, to reduced water availability, to more heat waves and fires.

Our planet is warming due to pollution from human activities. And a warming climate increases the likelihood of extreme weather.

The most important thing about global warming is this. Whether humans are responsible for the bulk of climate change is going to be left to the scientists, but it's all of our responsibility to leave this planet in better shape for the future generations than we found it.

We unfortunately already live on a planet where the climate has changed and will continue to change no matter what we do now. We're playing a game of making the problem less bad rather than preventing it.

Global warming is real - it is man-made and it is an important problem. But it is not the end of the world.