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This is Scientific American's 60-second science. I'm Christopher in Talata. Got a minute?

China emits over a quarter of the world's carbon, some 10 billion tons.

That's twice what we pump out here in the U.S.

But before the finger wagging begins, consider that a quarter of China's CO2 emissions

come from making exports.

In other words, stuff for countries like us.

So we're talking about 5 or 6% of global emissions are in these goods being exported from China.

And, you know, that may not sound like a lot,

but 5 or 6% of 35 billion tons is a lot of CO2.

Steve Davis is a climate energy scientist at the University of California, Irvine.

He and his colleagues wanted to see whether outsourcing manufacturing to China,

which happens to be good for our wallets, is also good for the planet.

Spoiler alert, doesn't look like it.

Because China is so reliant on coal for their energy, and because also they use less advanced

technologies and processes in some cases, there's a lot more CO2 being produced than if those

same goods were made in developed countries.

And that's especially true in certain areas of China, like the provinces of Yunnan or Guajou.

...