WASHINGTON - Daily global carbon dioxide emissions fell as much as 17 percent in April compared with last year, according to a study published in Nature Climate Change on Tuesday. The study said annual global CO2 emissions would fall 4 percent for the year if social distancing efforts end in mid-June, or 7 percent if such restrictions remain in force through the end of 2020, Pro's Zack Colman reports. That range would reflect the largest single-year decline since World War II.

Most researchers agree that emissions are all but certain to bounce back once countries reopen. Already, demand for energy is resuming as people return to the roads and as many U.S. states begin easing stay-at-home orders that drove the price per gallon of gasoline to less than $1 at some pumps.

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