As the federal government eases targets, a look at what gas mileage requirements really mean for vehicle mix, greenhouse gas emissions, jobs and more.
To call Puerto Rico's recovery efforts after Hurricane Maria slow would be an understatement. Some people in this U.S. territory went months without electricity and other basic services, and work continues in some of the more remote regions.
After a year of uncertainty over federal tax reform, tariffs on imported technology, and state-level policy changes, the U.S. solar energy industry appears to be stabilizing, adding 2.5 gigawatts of capacity in the first quarter of 2018.
Air pollution irritates kids' respiratory systems, but it can also prompt immune systems to start attacking healthy cells.