A trickle of transcripts!First up, an administrative note: many, many people have requested written transcripts of the Volts podcasts. And I want to provide them. But it’s going to take a while.I could produce the transcripts in a few hours if I were willing to simply send the sound files through a robot transcriber like Otter and accept the somewhat choppy results (which are generally around 85 percent accurate).However, I’m way too anal retentive to do that. And Volts readers deserve better! I want to clean the transcripts up — remove all the “sort of’s” and “kind of’s,” delete aborted or repeated sentences, polish up the grammar — so that they are as pleasant to read as they are to hear. (I’m not that precious about preserving the exact original words; I’m more interested in clearly capturing meaning in readable form.)That means closely copyediting these files, some of which are more than 10,000 words. So far, with a little help, I’ve gotten through … one. And it took about 10 people-hours of work. Sigh.Here’s the full transcript of my podcast with Rep. Sean Casten on “Hot FERC Summer” (and here’s a PDF version). For those who’d like a more compact version, here’s a highlight reel running on Canary.Hopefully these will get somewhat faster and easier going forward. I will let you know as they come out. Now, on to the main event.Pulling tipping points into climate economicsJust about everyone familiar with climate change has heard about “tipping points.” Famed climate scientist Wallace Broecker first raised the possibility way back in 1987, and ever since then, they’ve loomed large in the climate discussion.The idea behind tipping points is fairly simple and familiar: as heat accumulates in the atmosphere, Earth’s geophysical systems may not simply adjust in linear fashion, alongside the incrementally rising temperature; in some cases, they may “tip over” some unpredictable threshold and enter a fundamentally new state, sometimes called a “phase shift.” Think of ice that has slowly cracked suddenly shattering, or “the straw that broke the camel’s back.” The commonly cited examples of potential tipping points are the Greenland and West Antarctic ice sheets. As warming has progressed, they have been shedding water and developing deep fissures. It is possible that at some (unpredictable) point, one or both will lose integrity and begin breaking apart altogether, irreversibly, raising global sea level dozens of feet in relatively short order.Because the consequences of some oft-discussed tipping points are rather apocalyptic, they have been used and misused for a long time in climate communications. It has somewhat annoyed climate scientists, because not only are these tipping points not a sure thing, each one is, in its own right, relatively unlikely.Civilization-ending changes are not likely, but they’re not zero probability either. Legendary Harvard economist Martin Weitzman called these low-probability, high-impact possibilities “tail risks” and was famous for warning that economists are not taking them into account — and are thus underestimating the need for rapid decarbonization. In his book Climate Shock, co-authored with his protégé, New York University’s Gernot Wagner, he argued that the right way to think about climate mitigation is not through a cost-benefit lens, as though particular levels of spending avoid specific levels of damages, but instead as a kind of insurance. We purchase insurance to cover against tail risks all the time, not because we think they’re likely to happen, but because the consequences would be so dire if they did. Weitzman has passed away, but Wagner and others have carried on this argument long enough that it has begun to break through in mainstream climate economics. However, it leaves a key question unanswered: yes, the risk of tipping points raises the value of mitigation, but how much? It has never been quantified.Into that breach comes a new paper in the Proceedings of the National Academ