Sentences with phrase «tightening air pollution standards»
The rise of renewables, tightening air pollution standards and shale - driven reductions in gas prices saw coal's share of the US power mix fall from 46 % in 2009 to 39 % in 2014.
https://www.carbonbrief.org/
The rise of renewables, tightening air pollution standards and shale - driven reductions in gas prices saw coal's share of the US power mix fall from 46 % in 2009 to 39 % in 2014.