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Climate change could produce a lot of misery and waste without necessarily leading to large-scale armed conflict, which depends more on ideology and bad governance than on resource scarcity.

The problem with climate change is that it's quite complicated for the ordinary person to understand.

Often times when you face such an overwhelming challenge as global climate change, it can be somewhat daunting - it's kind of like trying to lose weight, which I know something about.

On climate change, we often don't fully appreciate that it is a problem. We think it is a problem waiting to happen.

I'm not in favor of just taking short-term isolated situations and depleting our resources to keep our climate just the way it is today.

Many climate change deniers would have you believe that addressing climate change is all pain and no gain. This is simply not true. We can tackle this challenge while improving our personal health and the health of our economy. These are not competing interests; they go hand in hand.

The world can't have a global solution to climate change with U.S. action alone; and the world can't have a global solution without U.S. action.

Climate change does not respect border; it does not respect who you are - rich and poor, small and big. Therefore, this is what we call 'global challenges,' which require global solidarity.

Global climate change has a profound impact on the survival and development of mankind. It is a major challenge facing all countries.