Launch event for this science/tech/policy initiative Wednesday, free registration here.
The 50×30 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.
Scientist’s Statement:
Continue reading “Can We Do 50×30 ?”As cryosphere scientists and research institutions, we are alarmed by the rapid changes from global warming that we see today in these polar and mountain regions. Most importantly, we need to communicate to the world that these changes, if they are allowed to continue, will not be reversible; and will spread across the entire globe.
We see this damage already today. Cold polar seas are acidifying more quickly than any on the planet, threatening humanity’s richest fisheries. Arctic sea ice continues to disappear at a stunning rate, with warming poles disrupting global weather patterns. Permafrost thaw is now releasing carbon at the same scale as a top-20 emitter, while intensified wildfires in drier sub-Arctic forests, grasslands and peatlands release even more. Shrinking glaciers and snowpack threaten reliable water supplies for billions of people, and rising sea levels from melting ice sheets will not be reversible on any human timescale.
Ambitious and effective near-term emissions reductions also lead to less reliance on carbon dioxide removal. These near-term reductions help avoid trade-offs with other needs such as food supply and ecosystem preservation, with. the necessary “negative emissions” achieved in more sustainable ways including more nature-based solutions.
The 2018 IPCC SR1.5 outlined the need for 50% global reductions by 2030 in order to remain within 1.5°C of warming. There are other non-cryosphere impacts from exceeding 1.5°C; but the cryosphere stands out because its changes will persist for hundreds or thousands of years – in the case of ocean acidification, 50-70,000 years.
This is truly an emergency of global proportions. We call on our governments, and other major stakeholders to listen to the science, and act accordingly.






