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United States per capita carbon emissions are still high relative to other countries, but have actually fallen about a third since their peak in 1973, and are now back to about what they were in 1918. 
Because of population growth, total U.S. emissions have fallen far less than per capita. But they're back down to around where they were in 1993.
In terms of consumption-based emissions, the drop has been slightly less, since the U.S. outsources a little bit of its emissions via imports.
2018 was a bad year for U.S. emissions, showing that these trends are not locked in.
nytimes.com/2019/01/08/cli…
nytimes.com/2019/01/08/cli…
In other words, recent trends give great reason for hope that the U.S. can continue to decrease its emissions substantially. But this is far from inevitable.
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