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Blueprints of future climate trends Extreme GHG and temperature rise rates question linear climate projections Andrew Glikson Earth and climate scientist Australian National University geospec@iinet.net.au Abstract The extreme greenhouse gas (GHG) and temperature rise rates since the mid-1970th raise questions over linear climate projections for the 21st century and beyond. Under a rise of CO₂-equivalent reaching +500 ppm and 3.0 W/m⁻² relative to 1750, the current rise rates of CO₂ by 2.86 ppm per and recent global temperature rise rate ( 0.15-0.20°C per decade ) since 1975 are leading to an abrupt shift in state of the terrestrial climate and the biosphere. By mid-21st century at >750 ppm CO₂-e climate tipping points indicated by Lenton et al. 2008 and Schellnhuber 2009 are likely to be crossed. Melting of the Greenland and Antarctic ice sheets has increased by a factor of more than 5 since 1979–1990. As the ice sheets and sea ice melt, the albedo flip between reflecti...

Beyond climate tipping points Greenhouse gas levels exceed the stability limit of the Greenland and Antarctic ice sheets by Andrew Glikson Abstract The pace of global warming has been grossly underestimated. As the world keeps increasing its carbon dioxide (CO₂) emissions, rising in 2018 to a record 33.1 billion ton  of CO₂ per year, the atmospheric greenhouse gas level has now exceeded 560 ppm (parts per million) CO ₂ -e quivalent , namely when methane and nitrous oxide are included. This level surpasses the stability threshold of the Greenland and Antarctic ice sheets. The term “climate change”   is thus  no longer appropriate, since what is happening in the atmosphere-ocean system, accelerating over the last 70 years or so, is an abrupt calamity on a geological dimension, threatening nature and human civilization. Ignoring what the science says, the powers-that-be are presiding over the sixth mass extinction of species, including humanity. As conveyed by leading...