But isn’t climate change natural?

Dr FINKEL SAYS: Yes, indeed, the world has cycled between ice ages and warm periods, with the ice ages repeating roughly every 100,000 years. Ice core samples going back about 800,000 years tell us the temperature rose much more slowly coming out of the glacial periods than we are experiencing now.

More importantly, if we don’t reduce our greenhouse gas emissions, the global temperature will increase well above the highest level seen in the last 800,000 years.