HN discussed [1] this topic three years ago when New York Magazine published "The Uninhabitable Earth" by David Wallace-Wells. In section II, Heat Death, he st

HN discussed [1] this topic three years ago when New York Magazine published "The Uninhabitable Earth" by David Wallace-Wells. In section II, Heat Death, he states, "At seven degrees of warming, that [human cooling] would become impossible for large portions of the planet’s equatorial band, and especially the tropics, where humidity adds to the problem." He adds, "At present, most regions reach a wet-bulb maximum of 26 or 27 degrees Celsius; the true red line for habitability is 35 degrees. What is called heat stress comes much sooner." The annotated version of that article [2] cites the 2010 paper, "An adaptability limit to climate change due to heat stress" [3] by Steven C. Sherwood and Matthew Huber for these claims. (Sections IV, Climate Plagues, and VII, Permanent Economic Collapse, from Wallace-Wells' article anticipate our current situation.) Wallace-Wells expanded his article into a book published last year, "The Uninhabitable Earth: Life After Warming." [4] I found the book informative, relentless, and somewhat depressing. Recommended. But don't take my word for it. [5] [1] https://news.ycombinator.com/item?id=14734865 https://news.ycombinator.com/item?id=14734865 [2] https://nymag.com/intelligencer/2017/07/climate-change-earth-too-hot-for-humans-annotated.html https://nymag.com/intelligencer/2017/07/climate-change-earth... [3] https://www.pnas.org/content/107/21/9552 https://www.pnas.org/content/107/21/9552 [4] https://penguinrandomhousehighereducation.com/book/?isbn=9780525576709 https://penguinrandomhousehighereducation.com/book/?isbn=978... [5] https://www.theguardian.com/books/2019/feb/27/the-uninhabitable-earth-review-david-wallace-wells https://www.theguardian.com/books/2019/feb/27/the-uninhabita...