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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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Climate change is real.

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Carbon dioxide from burning fossil fuels and clearing forests, among other human activities, is to blame.

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And more and more of that global warming pollution is being dumped in the atmosphere each year.

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So says the United Nations Intergovernmental Panel on Climate Change's new synthesis report released on November 2.

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The synthesis reduces thousands of pages of scientific knowledge to their essence.

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That essence, however, has hardly changed since the last synthesis report in 2007.

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What has changed is the concentrations of greenhouse gases in the atmosphere, which have now touched 400 parts-per-million.

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Pollution in the first decade of the 21st century grew twice as fast as it did in the last few decades of the 20th century.

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The resulting global warming poses risks ranging from rising sea levels that drown inhabited coasts to crop failures from stronger heat waves and drought.

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The IPCC has now offered a budget for how much pollution people can add to the atmosphere without too much climate change.

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Unfortunately, humanity has already used more than half of that budget.

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The world's nations are meeting in Lima this year in hopes of hammering out a global deal to combat climate change to be agreed upon in Paris in 2015.

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The new report is a reminder to world leaders that the stakes, like the seas, are high.

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.

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