The headline at The Guardian says almost everything you need to know: U.S. carbon emissions fall to lowest levels since 1994.

Carbon dioxide emissions fell by 13% in the past five years, because of new energy-saving technologies and a doubling in the take-up of renewable energy, the report compiled by Bloomberg New Energy Finance for the Business Council for Sustainable Energy (BCSE) [PDF] said.

The reduction in climate pollution — even as Congress failed to act on climate change — brings America more than halfway towards Barack Obama’s target of cutting emissions by 17% from 2005 levels over the next decade, the Bloomberg analysts said.

By the end of last year, America’s emissions of carbon dioxide and other greenhouse gas emissions had fallen 10.7% from the 2005 baselines.

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The caveat:  The carbon emissions discussed are those related to energy production. Energy production isn’t all CO2 emission, but it’s a lot of it.

So here’s what that reduction looks like. Since 1974, levels of energy-related carbon emissions have seen two peaks. As indicated above, we’re on a downward trend, something David Roberts explained last year.

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Over the past few years, individual energy sources have played a fluctuating role in the reduction. In 2009, the collapsing economy meant lower emissions from all sources. That coal figure in 2012 is remarkable.

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This morning, the U.S. Energy Information Administration released state-by-state data on CO2 emissions through 2010. We put together this map showing net increase or reducton in CO2 emissions by state between 1994 and 2010. The darker brown a state is, the more its emissions rose; the darker green, the more emissions fell. Most states went up. But go Delaware!

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The reduction — particularly the shift to renewables — is good news. Tempered with two caveats: This is only the United States. And the rate of decline is still far too low.