By Lucas Davis
This is the worst year in decades for U.S.
. During the first six months of 2016, U.S. coal production was
down a staggering 28 percent compared to 2015 and down 33 percent compared to 2014
. For the first time ever, natural gas
as the top source of U.S. electricity generation last year and remains that way. Over the past five years, Appalachian coal production has been
cut in half
and many coal-burning power plants have
A number of coal plants in the U.S. are closing in response to competition from inexpensive and cleaner natural gas.
Booleansplit / Flickr
This is a remarkable decline. From its peak in 2008, U.S. coal production has declined by 500 million tons per year—that’s 3,000 fewer pounds of coal per year for each man, woman and child in the U.S. A typical 60-foot train car holds
of coal, so the decline is the equivalent of five million fewer train cars each year, enough to go twice around the Earth.
This dramatic change has meant
tens of thousands
of lost coal jobs, raising many difficult social and
for coal communities. But it’s an unequivocal benefit for the local and global environment. The question now is whether the trend will continue in the U.S. and, more importantly, in fast-growing economies around the world.
Health Benefits from Coal’s Decline
50 percent carbon
, so burning less coal means lower carbon dioxide emissions. More than 90 percent of U.S. coal is used in electricity generation, so as cheap natural gas and environmental regulations have
pushed out coal
, this has decreased the carbon intensity of U.S. electricity generation and is the main reason why U.S. carbon dioxide emissions are
down 12 percent
compared to 2005.
Perhaps even more important, burning less coal means less air pollution. Since 2010, U.S. sulfur dioxide emissions have
decreased 57 percent
and nitrogen oxide emissions have
decreased 19 percent
. These steep declines reflect less coal being burned, as well as upgraded pollution control equipment at about
of existing coal plants in response to new rules from the U.S. Environmental Protection Agency.
These reductions are important because air pollution is a major health risk. Stroke, heart disease, lung cancer, respiratory disease and asthma are
with air pollution. Burning coal is about
18 times worse
than burning natural gas in terms of local air pollution so substituting natural gas for coal lowers health risks substantially.
Economists have calculated that the environmental damages from coal are
per megawatt-hour for air pollution and
per megawatt-hour for carbon dioxide. U.S. coal generation is down from its peak by at least
700 million megawatt-hours
annually, so this is $45 billion annually in environmental benefits. The decline of coal is good for human health and good for the environment.
India and China
The global outlook for coal is more mixed. India, for example, has
coal consumption since 2005 and now exceeds U.S. consumption. Energy consumption in India and other developing countries has
forecasts, so don’t be surprised if coal consumption continues to surge upward in low-income countries.
In middle-income countries, however, there are signs that coal consumption may be slowing down. Low natural gas prices and environmental concerns are challenging coal not only in the U.S. but around the world and forecasts from
the Energy Information Administration
have global coal consumption slowing considerably over the next several years.
Particularly important is China, where coal consumption
between 2000 and 2012, but more recently has slowed considerably. Some are arguing that China’s coal consumption may have
, as the Chinese economy shifts away from heavy industry and toward
cleaner energy sources
. If correct, this is an astonishing development, as China represents
of global coal consumption and because previous projections had put China’s peak at 2030 or beyond.
The recent experience in India and China point to what environmental economists call the “
Environmental Kuznet’s Curve
.” This is the idea that as a country grows richer, pollution follows an inverse “U” pattern, first increasing at low-income levels, then eventually decreasing as a country grows richer. India is on the steep upward part of the curve, while China is,
perhaps, reaching the peak
Global Health Benefits of Cutting Coal
A global decrease in coal consumption would have enormous environmental benefits. Whereas most U.S. coal plants are equipped with scrubbers and other pollution control equipment, this is
not the case
in many other parts of the world. Thus, moving off coal could yield much larger reductions in sulfur dioxide, nitrogen oxides and other pollutants than even the sizeable recent U.S. declines.
Of course, countries like China could also install scrubbers and keep using coal, thereby addressing local air pollution without lowering carbon dioxide emissions. But at some level of relative costs, it becomes cheaper to simply start with a cleaner generation source. Scrubbers and other pollution control equipment are expensive to install and expensive to run, which hurts the economics of coal-fired power plants relative to natural gas and renewables.
Broader declines in coal consumption would go a long way toward meeting the world’s
goals. We still use globally more than
of coal annually per person. More than
of total global carbon dioxide emissions come from coal, so global
policy has correctly focused squarely on reducing coal consumption.
If the recent U.S. declines are indicative of what is to be expected elsewhere in the world, then this goal appears to be becoming more attainable, which is very good news for the global environment.
Lucas Davis is an associate professor at the Haas School of Business, faculty director at the
Energy Institute at Haas
and research associate at the National Bureau of Economic Research.
This article was reposted with permission from our media associate