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If we do not change our negative habits toward climate change, we can count on worldwide disruptions in food production, resulting in mass migration, refugee crises and increased conflict over scarce natural resources like water and farm land. This is a recipe for major security problems.

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.

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.

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.

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

What do we do about climate change bearing down upon us?

In my personal belief, the big problem with climate change is getting people to understand the magnitude and scale that we're dealing with. If you buy a vehicle that gets 35 miles to the gallon, that means nothing; it's not enough. We need to make changes across society and in every piece of the energy pie.

The impact of climate change is a tremendous risk to the security and well-being of our countries.

Any objective look at what science has to say about climate change ought to be sufficient to persuade reasonable people that the climate is changing and that humans are responsible for a substantial part of that - and that these changes are doing harm and will continue to do more harm unless we start to reduce our emissions.

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.