The IPCC has made it clear that 50% emissions reductions must occur globally by 2030 to remain close to 1.5\u00b0C of warming; and prevent cascading and irreversible damage, on a planetary scale, from the impact of greenhouse gas emissions on the cryosphere. As the above papers make clear, overshoot of the 1.5\u00b0C limit cannot be considered a viable or safe option, from either an economic or social standpoint. Much of the Earth\u2019s polar and mountain regions \u2013 including glaciers, snowpack, permafrost, sea ice, polar oceans and ice sheets \u2013 directly react to peaks in temperature and carbon dioxide emissions; and 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. This session features a deeper and more detailed analysis of the NDCs from a number of countries, both 50×30-consistent and those needing strengthened policies to reach the needed emissions reductions needed to keep the 1.5\u00b0C goal.<\/p>\n
Main presenters include Joeri Rogelj, IPCC AR5 CLA, SR1.5 CLA, and AR6 LA, Director of Research at the Grantham Institute; and Ryan Wilson, Climate and Energy Policy Analyst at Climate Analytics.<\/p>\n