After six years and a lot of sweat, the IPPC has completed its fourth report. The Synthesis Report [PDF], released today in Valencia, pulls together the key findings of the three working groups, and provides a 23 page overview of the problem and its potential solutions. Ban Ki-moon, the UN secretary general, welcomed the report:
“Today the world’s scientists have spoken clearly and with one voice,” he said. “In Bali I expect the world’s policymakers to do the same.”
The most succinct summary of the contents comes from Joseph Romm at Climate Progress: “Debate over, further delay fatal, action not costly.” Couldn’t have put it better myself.