Six years ago,
in its last report, the IPCC concluded that there was a 90 percent certainty that human activity was responsible for most of Earth’s warming. The 2013 draft summary increased that certainty to 95 percent.
“Human influence on climate caused more than half of the observed increase in global surface temperature from 1951-2010,” the report said. “There is high confidence that this has warmed the ocean, melted snow and ice, raised global mean sea level, and changed some climate extremes, in the second half of the 20th century.”
The IPCC — composed of hundreds of scientists, including from federal agencies — tracks the impact of global warming on specific regions and species