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1 .This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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2 .Climate change is real.
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3 .Carbon dioxide from burning fossil fuels and clearing forests, among other human activities, is to blame.
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4 .And more and more of that global warming pollution is being dumped in the atmosphere each year.
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5 .So says the United Nations Intergovernmental Panel on Climate Change's new synthesis report released on November 2.
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6 .The synthesis reduces thousands of pages of scientific knowledge to their essence.
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7 .That essence, however, has hardly changed since the last synthesis report in 2007.
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8 .What has changed is the concentrations of greenhouse gases in the atmosphere, which have now touched 400 parts-per-million.
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9 .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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10 .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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11 .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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12 .Unfortunately, humanity has already used more than half of that budget.
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13 .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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14 .The new report is a reminder to world leaders that the stakes, like the seas, are high.
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15 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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