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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.

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

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.

It should simply be an empirical matter whether the climate is changing or not and whether we're responsible. But the various sides of the debate have now become so tribal that it's no longer a matter of changing our views as more information comes in.

By burning fossil fuels, we are already dumping 30 billion tons of CO2 into the atmosphere every year, which has a profound effect on the climate. So, like it or not, we're already messing with a system we don't understand.

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

We really need to kick the carbon habit and stop making our energy from burning things. Climate change is also really important. You can wreck one rainforest then move, drain one area of resources and move onto another, but climate change is global.

Even if we were to stop putting out greenhouse gases right now, we'd still face decades of warming.