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And climate change appears to be leading to an increase in those persistent weather extremes in a way that isn't well captured by the climate models. That's when you see the most profound extreme weather impacts when you get these very persistent extreme weather events. So you get those extreme heat conditions day after day in the same location or rainfall day after day in the same location. It's the way that the pattern of warming is changing the behavior of the Jet stream, its causing it to get stuck in more of a wiggly pattern, where you get those big high and low pressure systems associated alternatively with extreme heat, drought and wildfire or extreme flooding, and they remain sort of locked in place.
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But there's something else on top of that, which is a little more subtle, and which isn't all that well captured in the climate models. So that part is all pretty straightforward, it's all basic physics. You combine the heat and the drought, you get the sorts of catastrophic wildfires that we're seeing out in the western US that we're seeing in Europe that we've seen down in Australia. And the the heat dries out the soils in the summer so you get worst drought, more widespread drought. So when it does rain, you get more rainfall, you get more precipitation, you get more of those flooding events. You also warm up the atmosphere, so it holds more moisture. MANN: Yeah, well, you know, it's not rocket science, you warm up the planet, as we're doing with carbon pollution, you're going to get more of these extreme heat waves, more frequent heat waves, so that's a no brainer. What’s going on? What's happening in terms of climate disruption? Louis, to Dallas and most recently, we're looking at the problem in Jackson, Mississippi, where flooding has taken out the water system. MANN: Thanks, Steve, always great to be with you.ĬURWOOD: So, in these last few weeks, we've seen just crazy intense weather, a third of Pakistan flooded now, after they had record heat earlier this summer, cities all over the United States and places from Death Valley to St. For some insights into extreme weather and what the models did and did not predict we turn now to Michael Mann, a professor of Atmospheric Science at the University of Pennsylvania, and he joins us now from Philadelphia. Science started warning us decades ago that global warming would increase atmospheric moisture and lead to climate disruption, and now we are living with the predictions of those climate models. I’m Steve Curwood.Įxtreme weather, it seems, is now almost the norm, despite the horrendous toll it’s taking on humans and countless other species.
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(Photo: Mulugeta Ayene, Flickr, CC BY-NC-ND 2.0)ĬURWOOD: From PRX and the Jennifer and Ted Stanley Studios at the University of Massachusetts Boston, this is Living on Earth.
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In the picture above two boys walk to their settlements in Hadhwe sub-district, which has been particularly hard hit by the drought. Years of insufficient rainfall across the Horn of Africa have caused the worst drought in 40 years. Extreme Weather Events and Climate Science MANN: We've gotta prevent whatever warming we can and that requires more aggressive climate policy, that requires people voting in these midterm elections for climate champions and voting out those who have acted as apologists for the fossil fuel industry so we can meet that 50% target that we really need to meet.ĬURWOOD That and more this week on Living on Earth – Stick Around!
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But, because for the first time in a while, the wind is in their sails, and that means a lot, and that gets people excited to vote.ĬURWOOD: Also, world wide extreme weather events highlight the need for climate action Not because they have an in-depth understanding of what the Inflation Reduction Act means and what more we need, they don't. STINNETT: Now a lot of them are really, really excited. Passage of the big climate bill may spur more green voters to turn up for the midterm elections. GUESTS: Todd Nedwick, Michael Mann, Nathaniel StinnettĬURWOOD: From PRX – this is Living On Earth.
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