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Climate experts “surer than ever”: It’s our fault

What counts as an exciting leak in the field of climate change science is advanced data from the UN's Intergovernmental Panel on Climate Change (IPCC) Fifth Assessment Report, which Reuters attained over the weekend.

And while the news -- that global warming is almost certainly caused by human activity -- is something many of us already know by now, it always helps to put a number on things. So here it is: "It is at least 95 percent likely that human activities – chiefly the burning of fossil fuels – are the main cause of warming since the 1950s."

To put that in context, experts were only willing to commit to a 90 percent likelihood when the last report was released, in 2007. In 2001, they were only 66 percent ready to blame human activity. In 1995, when the IPCC issued its first report, expert opinion was almost equally divided.

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