We see far greater risk of massive irreversible sea level rise (SLR) at 2°C, on a scale of 12–20 meters or more in the long term. The climate record of the Earth over the pat few million years is quite clear:
Sea Level Rise from Ice Sheets
We see far greater risk of massive irreversible sea level rise (SLR) at 2°C, on a scale of 12–20 meters or more in the long term. The climate record of the Earth over the pat few million years is quite clear:
Sea Level Rise from Ice Sheets
50x30
MISSION STATEMENT
The 50x30 coalition is an alliance between cryosphere and emissions research institutions, and governments that have accepted the scientific necessity to reduce emissions 50% by 2030; in order to prevent cascading and irreversible damage, on a planetary scale, from the impact of greenhouse gas emissions on the cryosphere.
Because of cryosphere, carbon neutrality by 2050 is not enough: the way we get there matters.
Overshoot of the 1.5°C goal cannot be considered a viable or safe option, from either an economic or social standpoint. This is because much of the Earth’s polar and mountain regions – whether glaciers, snowpack, permafrost, sea ice, polar oceans and seas, or the great polar ice sheets – react directly to peaks in temperature and carbon dioxide emissions.
This can tip many of these systems into a state of decline, where a later return to lower temperatures and CO2 levels makes little difference: the damage is done, and cannot be reversed on any human timescale.
We cannot negotiate with the melting point of ice.
In pathways with no or limited overshoot of 1.5°C, anthropogenic CO2 emissions [must] decline 45-60% [median 50%] by 2030.
- from Summary for Policymakers, IPCC Special Report on 1.5° of Warming, 2018 -
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