![](https://pbs.twimg.com/media/ELSloskXUAEudV5.jpg)
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is now located at 1°C of global warming and high risk is
located at 2.5°C of global warming, because of new
observations and models of the West Antarctic ice sheet (with medium confidence).
ipcc.ch/sr15/chapter/c…
![](https://pbs.twimg.com/media/ELSlt_aXUAAULB5.jpg)
Antarctica or irreversible loss of the Greenland ice sheet
- it is more likely than not that the AMOC has been weakening in recent decades,
- there is limited evidence linking the recent weakening of the AMOC to anthropogenic warming
- there is no evidence indicating significantly different amplitudes of AMOC weakening for
1.5°C versus 2°C of global warming, or of a shutdown of the AMOC at these global temperature thresholds.
No evidence of a tipping point for Arctic sea ice itself (different of course for related ecosystems or species).
![](https://pbs.twimg.com/media/ELSlwM3XYAAKKWm.jpg)
ipcc.ch/srccl/
![](https://pbs.twimg.com/media/ELSxYkFXUAAtJNr.jpg)
![](https://pbs.twimg.com/media/ELSxYkeX0AEdUL2.jpg)
![](https://pbs.twimg.com/media/ELSxcmQXsAEol15.jpg)
![](https://pbs.twimg.com/media/ELSxcn8XYAElexP.jpg)
several major Amundsen Sea outlets, including Thwaites, Pine Island, Smith, and Kohler glaciers
projections of the sea level contributions from the Antarctic ice sheet.
![](https://pbs.twimg.com/media/ELSxiwDX0AEyKBQ.jpg)
![](https://pbs.twimg.com/media/ELSxiyPXUAAAwwt.png)
![](https://pbs.twimg.com/media/ELSxi1AWkAAUt1d.png)
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surface temperature reconstructions, indicate that the Atlantic Meridional Overturning Circulation (AMOC) has weakened relative to 1850–1900
rainfall,
there are considerable knowledge gaps in adaptation responses to a substantial AMOC weakening.
sheet instability.
atmosphere, ocean and the ice sheet
a collapse of parts of the Antarctic Ice Sheet entails, this high impact risk merits attention
adapted to unforeseen conditions) often prefer to use the likely range of projections,