And the really scary thing is that anything above +8℃ has a very real chance of flipping the planet into a Venus Scenario. Recent work has shown that the Earth sits at the very inner edge of the solar system’s habitable zone. As the sun has aged across billions of years and burned through its fuel, it has heated up and moved the zone outward. As such, the planet could have had higher greenhouse gas levels in the past with life still surviving, but it cannot have such levels now without life dying and the planet becoming a second Venus. At +8℃, equatorial cloud cover becomes impossible to generate, and the amount of oceanic heating accelerates. Methyl Hydrates begin boiling off everywhere, and it becomes too hot to live between the 60th parallels - humanity (or what’s left of it) must pack itself around the poles to survive. At some point, the amount of greenhouse gas creation exceeds the ability of life to counteract said gases, and things heat up until all life on the planet dies.