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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