******************** POSTING RULES & NOTES ******************** #1 YOU MUST clip all extraneous text when replying to a message. #2 This mail-list, like most, is publicly & permanently archived. #3 Subscribe and post under an alias if #2 is a concern. *****************************************************************
https://arctic-news.blogspot.com/2019/03/climate-tipping-points.html?m=1 *Anthropocene tipping points* “During the late Anthropocene³, accelerating since about 1960, the rise of radiative forcing due mainly to increasing greenhouse gas concentration above >457 ppm CO₂-equivalent, accounts for a rise of mean global temperatures by 0.98°C since 1880 *(NASA (2018) *A further rise by more than >0.5°C is masked by aerosols, mainly sulphur dioxide and sulfuric acid *(Hansen et al., 2011)*. The temperature rise is potentially further enhanced by amplifying feedbacks from land and oceans, including infrared absorption by water surfaces following sea ice melting, reduction of CO₂ concentration in warming water, release of methane and fires. However, climate change trajectories are likely to be highly irregular as a result of stadial ocean cooling events affected by flow of ice melt. Whereas similar temperature fluctuations including stadial events have occurred during past interglacial periods *(Cortese et al. 2007; figure 1)*, with a further rise in atmospheric greenhouse gases the intensity and frequency of extreme weather events would enter uncharted territory unlike any recorded during the Pleistocene, potentially rendering large parts of the continents uninhabitable *(Wallace-Wells, 2019)*.“ _________________________________________________________ Full posting guidelines at: http://www.marxmail.org/sub.htm Set your options at: https://lists.csbs.utah.edu/options/marxism/archive%40mail-archive.com
