An ice cave near Pastoruri glacier, one of the fastestreceding glaciers in the Andes (Mariana Bazo/Reuters).
UN Panel Agrees on "Tipping Point" for Carbon Emissions
In a landmark report by the UN's panel on climate change, scientists for the first time established an upper limit for global carbon emissions. Stating with near certainty that humans have been the dominant cause of global warming since the 1950s, the panel warned that "most aspects of climate change will persist for many centuries even if emissions of CO2 are stopped."










