Note to Mark Steyn: Bigfoot isn't real. The Loch Ness Monster isn't real. But climate change is real, and therefore doesn't require the scare quotes you habitually append to the term. Even if you believe (dubiously) that global warming is not at all anthropogenic, there's still no valid denial of the existence of global warming, which is a form of climate change, which is therefore real.
Here's a chart from the EPA on climate change.