Climate change report: “extremely likely” humans are responsible

September 27, 2013 — Updated 0857 GMT (1657 HKT) (CNN) — Human activity has caused at least half of climate change in the last half century, hundreds of scientists say. They are 95% certain of this, the surest they’ve ever been, says a United Nations report published Friday. That activity? Driving cars, running power plants on coal and oil, torching swathes of forestland and debris; anything involving burning carbon-based fuels and emitting greenhouse gasses. The Assessment Report from the Intergovernmental Panel on Climate Change is the benchmark study on global warming published every few years. Nearly 1,000 researchers from around the world work on the document, which then undergoes…
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