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

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Despite the Great Recession, more people are better off around the world today than ever before.

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At the same time, atmospheric carbon dioxide levels have never been higher in human history, thanks to fossil fuel burning, forest clearing and other activities that make people rich.

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So what can be expected if the world increases the wellbeing of an ever increasing proportion of people?

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In short: even more CO2.

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That's the finding of a study in the journal Nature Climate Change.

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Economists and policy analysts held out hope that global wealth could continue to rise without also raising CO2 emissions.

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But a look back at life expectancy at birth compared with per capita pollution around the world from 1970 to 2009 suggests otherwise.

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Economic development in the poorest countries starts off by reducing CO2 pollution in the 1970s and 1980s,

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perhaps because fossil fuel burning replaces even more polluting fires in individual homes.

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But in more recent years that benefit has leveled off.

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And developed countries like the U.S.or China seem to increase emissions whenever the economy grows.

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A switch to energy sources that produce less CO2 seems key to breaking that link.

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In the long run, after all, checking climate change is vital to human wellbeing too.

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

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