As U.S. Cleans Its Energy Mix, It Ships Coal Problems Abroad
Ready for some good news about the environment? Emissions of carbon dioxide in the United States are declining. But don’t celebrate just yet. A major side effect of that cleaner air in the U.S. has been the further darkening of skies over Europe and Asia.
The United States essentially is exporting a share of its greenhouse gas emissions in the form of coal, data show. If the trend continues, the dramatic changes in energy use in the United States—in particular, the switch from coal to newly abundant natural gas for generating electricity—will have only a modest impact on global warming, observers warn. The Earth’s atmosphere will continue to absorb heat-trapping CO2, with a similar contribution from U.S. coal. It will simply be burned overseas instead of at home.