A new report by the UN Environment Programme (UNEP) finds that in order to limit global temperature rise to 2 degree Centigrade and head off the worst impacts of climate disruption, global carbon neutrality must be achieved by mid-to-late century.
Missing that mark would increase the risk of severe, pervasive, and in some cases irreversible climate change impacts, and drastically increase the costs of any possibility of still meeting the 2 degree goal.
Emissions Gap Report 2014 builds on the findings of the IPCC synthesis report issued earlier this month. It finds that greenhouse gas emissions must peak within the next ten years and fall by half by mid-century. In the second half of the century, the world must achieve carbon neutrality between 2055 and 2070, followed by net zero of all greenhouse gas emissions between 2080 and 2100.
There's little new in this latest report. The challenge is immense.