USA/Climate doesn’t change by magic.

Just ask Mark Serreze, director of the U.S. National Snow and Ice Data Center in Colorado. On a conference call with other scientists and reporters, Serreze and others linked climate change to the last two harsh winters over much of the United States and Europe. And they squarely blamed human-caused greenhouse gas emissions for the rise in world temperatures that got the process going.

“Climate doesn’t change all by itself,” Serreze said. “It’s not like the Harry Potter theory of climate, where he flicks his magic wand and the climate suddenly changes. Climate only changes for a reason.”

He crossed off other possible drivers for climate change one by one.

“Could it be that the Sun is shining more brightly than it was? No, that doesn’t work. We’ve been monitoring energy coming from the Sun and apart from the 11-year sunspot cycle, there’s not much happening.

USA/“Is it that the warming is coming from the oceans — the oceans are releasing heat into the atmosphere? … Well, if that were the case, we’d have to observe that the oceans are cooling … but oceans are not cooling, the oceans are warming like the atmosphere.

“We might be able to argue that it’s something we don’t understand, something like a cosmic ray flux modulated by the Sun … That’s pretty much of a cop-out, OK? Because you’re not really making an explanation, you’re making a supposition.”