Nine active tipping points

Exiting the fossil fuel economy is unlikely before 2050, but with temperature already at 1.1°C above pre-industrial temperature, it is likely Earth will cross the 1.5°C guardrail by 2040. The authors conclude this alone defines an emergency.

Nine active tipping points:

  1. Arctic sea ice
  2. Greenland ice sheet
  3. Boreal forests
  4. Permafrost
  5. Atlantic Meridional Overturning Circulation
  6. Amazon rainforest
  7. Warm-water corals
  8. West Antarctic Ice Sheet
  9. Parts of East Antarctica

The collapse of major ice sheets on Greenland, West Antarctica and part of East Antarctica would commit the world to around 10 metres of irreversible sea-level rise.

Reducing emissions could slow this process, allowing more time for low-lying populations to move.

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