It used to be that power plants caused a lot of pollution, and coal-fired plants in 2011 contributed to 1.7 billion tons of carbon dioxide a year. As reported in Bloomberg News today it is cars, trucks, planes and boats that are the biggest source of U.S. greenhouse gas pollution
So how did that happen? While electricity use has not declined, it is now being generated from cleaner sources, most notably by the decline in using coal power. Coal has declined as a source by 33 per cent in the last decade, while natural gas usage has increased by 60 per cent. It is the clean up of the power sources for the electricity grid which has made the major change.
Carbon dioxide emissions from vehicles, planes and boats exceeded that of electrical production in 2016, and has continued to widen.While cars are more efficient, the United States is considering under the Trump administration “rolling back the toughest fuel-efficiency standards, which are set to take effect in the early 2020s.”
The development of electric cars and the continuing decline in the price of battery packs will eventually impact emissions. It is expected that by the mid 2020’s electric cars will be the standard for reliability and convenience than the gasoline-powered equivalents. And here is where it gets interesting~”When the electrification of the U.S. auto fleet begins in earnest, pollution from the two biggest energy sectors—electricity and transportation—may ultimately converge. Those electric cars are going draw their power from the grid.”