You are currently viewing the summary.
View Full TextLog in to view the full text
AAAS login provides access to Science for AAAS members, and access to other journals in the Science family to users who have purchased individual subscriptions.
More options
Download and print this article for your personal scholarly, research, and educational use.
Buy a single issue of Science for just $15 USD.
Summary
Every time the U.N. Intergovernmental Panel on Climate Change (IPCC) issues a new report surveying the science of global warming, the alarm sounds louder. Now, 8 years after its last report, the message of IPCC's latest assessment, released this week, is urgent and unequivocal: The window for mitigating the worst projected impacts of global climate change is closing. Average global temperatures are now 1.1°C above preindustrial records, and under every scenario for future greenhouse gas emissions that the panel examined, average warming of 1.5°C—a target set by the 2015 Paris climate accord—will very likely be reached within the next 20 years.
