HARROW: Here’s something you don’t hear climate scientists say very often:“The bottom line is that things are not that complicated.”
That’s Reto Knutti, head of the Climate Physics Group at the Swiss Federal Institute of Technology in Zurich, speaking with The New York Times. And that warm feeling inside of you is the satisfaction of knowing that you’re about to understand some science!
Take a moment to savor that feeling. Knutti is a climate scientist, after all, so we know that whatever he says next is going to be a huge downer:
“You make the world a degree or two warmer, and there will be more hot days. There will be more moisture in the atmosphere, so that must come down somewhere.”
Wow, dude — that’s not science, that’s poetry. (Except that it is science, and the subject of a new paper that Knutti and his colleague Erich M. Fischer published yesterday in the journal Nature Climate Change.)
Using global climate models to simulate past and future warming scenarios, the duo set out to understand how anthropogenic climate change has and will continue to increase extreme heat and precipitation events — the hotter days and wetter air that Knutti was talking about.
Here’s what they found: Compared to a world where the industrial revolution never happened, today’s warming of about 1.5 degree Fahrenheit is responsible for a 22 percent increase in the frequency of extreme precipitation events and — more dramatically — a four- to five-fold increase in the frequency of 1-in-1,000 day extreme heat events.
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