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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.

Global warming is something that happens to all of us, all at once.

So much of what we do addresses the issues that are associated with climate change, whether it's working to reduce emissions, whether it's working to nail down our renewables, whether it's ensuring great efficiency in accessing all of our energy sources.

Clean air and a healthy climate benefit all of us, but it will take a diverse coalition to step up to the threat posed by unchecked climate change.

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

We have shared responsibility for global climate; we have to reduce climate change below 2 degrees Celsius.

Today, we can see with our own eyes what global warming is doing. In that context it becomes truly irresponsible, if not immoral, for us not to do something.

The only thing that will really change global warming in the long run is if we radically increase the speed with which we get alternative technologies to deal with climate change.

Around the world, climate change is an existential threat - but if we harness the opportunities inherent in addressing climate change, we can reap enormous economic benefits.