From Earth Policy Institute
Tuesday, August 24, 2004
Janet Larsen
Startling new research shows that one out of every six women of childbearing
age in the United States may have blood mercury concentrations high enough to
damage a developing fetus. This means that 630,000 of the 4 million babies
born in the country each year are at risk of neurological damage because of
exposure to dangerous mercury levels in the womb.
Fetuses, infants, and young children are most at risk for mercury damage to
their nervous systems. New studies show that mercury exposure may also damage
cardiovascular, immune, and reproductive systems. Chronic low-level exposure
prenatally or in the early years of life can delay development and hamper
performance in tests of attention, fine motor skills, language, visual spatial
skills, and verbal memory. At high concentrations, mercury can cause mental
retardation, cerebral palsy, deafness, blindness, and even death.
Humans are exposed to mercury primarily by eating contaminated fish.
Forty-five of the 50 states have issued consumption advisories limiting the
eating of fish caught locally because of their high mercury content. New
analyses of fish samples collected by the Environmental Protection Agency
(EPA) from 500 lakes and reservoirs across the country found mercury in every
single sample. In 55 percent of them, mercury levels exceeded the EPA's
"safe" limit for a woman of average weight eating fish twice a week,
and 76 percent exceeded limits for children under the age of three. Four out
of five predator fish-those higher on the food chain, such as tuna or
swordfish-exceeded the limits.
The largest source of mercury pollution is coal-fired power plants. Airborne
mercury emitted by these facilities is deposited anywhere from within a few
hundred kilometers of the smokestacks to across continents, far from its
source. Biological processes change much of the deposited mercury into
methylmercury, a potent neurotoxin that humans and other organisms readily
absorb. Methylmercury easily travels up the aquatic food chain, accumulating
at higher concentrations at each level. Larger predator species contain the
most mercury, which is then passed on to those who eat them.
Since the industrial revolution began, mercury contamination in the
environment has jumped threefold. The 600 plus coal-fired power plants in the
United States, which produce over half of the country's electricity, burn 1
billion tons of coal and release 98,000 pounds (44 metric tons) of mercury
into the air each year. Power plants yield an additional 81,000 pounds of
mercury pollution in the form of solid waste, including fly ash and scrubber
sludge, and 20,000 pounds of mercury from "cleaning" coal before it
is burned. In sum, coal-fired power plants pollute the environment with some
200,000 pounds of mercury annually.
Solid wastes from coal-fired power plants also contain heavy metals like
arsenic, selenium, chromium, and cadmium; carcinogenic organic compounds; and
radioactive elements. These toxins can leach into streams and groundwater
supplies, compromising people's health.
Other atmospheric emissions from burning coal include sulfur dioxide (SO2),
carbon dioxide (CO2), particulate matter, and nitrogen oxides (NOx), which in
turn form ground-level ozone. SO2 and ozone are highly corrosive gases that
cause respiratory distress and contribute to low birth weight and increased
infant mortality. SO2 and NOx are also the primary causes of acid rain. CO2 is
the dominant gas responsible for the greenhouse effect that is warming the
planet.
Particulate matter from coal combustion has long been known to harm the
respiratory system. Now recent research has shown that small airborne
particulate matter also can cross from the lungs into the bloodstream, leading
to cardiac disease, heart attacks, strokes, and premature death.
In the United States, 23,600 deaths each year can be attributed to air
pollution from power plants. Those dying prematurely due to exposure to
particulate matter lose, on average, 14 years of life. Burning coal also is
responsible for some 554,000 asthma attacks, 16,200 cases of chronic
bronchitis, and 38,200 non-fatal heart attacks each year. Atmospheric power
plant pollution in the United States racks up an estimated annual health care
bill of over $160 billion.
The Bush administration's so-called Clear Skies initiative allows for an
increase in SO2, NOx, particulate matter, and mercury pollution above the
levels permitted under the existing Clean Air Act, and it does nothing to
limit climate-disrupting CO2. Older coal-burning power plants failing to meet
modern air emissions standards release 10 times more NOx and SO2 than modern
coal plants do. Under the administration's plans, these "grandfathered"
plants could continue to circumvent emissions controls-with unhealthy effects.
Although pollution scrubbers in modern smokestacks do reduce air pollution,
they do nothing to help the coal miners who die each year in mine accidents or
from diseases brought on by breathing hazardous coal dust. While the annual
number of worker fatalities on-site in the 2,000 U.S. coal mines has fallen to
around 30, pneumoconiosis-commonly known as black lung disease-kills an
estimated 1,500 former coal miners a year. One in every 20 miners in the
United States has X-ray evidence of this disease, a number that is bound to
worsen if the Bush administration succeeds with plans to quadruple allowable
levels of coal dust in mines.
Using coal, a hazardous nineteenth-century fuel, when we have
twenty-first-century alternatives is hard to understand. Renewable energy
sources, such as wind and solar, do not require dangerous mining or
mountaintop removal, nor do they pollute the air, land, and water with a slew
of toxic chemicals. Full-cost pricing of coal to include the environmental
damages and the enormous health care burden of using it, combined with
removing antiquated subsidies on all fossil fuels, could go a long way toward
encouraging more investment in renewables.
In addition, simple energy efficiency measures can reduce our reliance on
fossil fuels and save money, too. Research from the Alliance to Save Energy
indicates that improving efficiency standards for household appliances in the
United States could allow 127 power plants to close. More stringent air
conditioner efficiency standards could shut down 93 power plants. And raising
the efficiency standards of both new and existing buildings through mechanisms
like tax credits and energy codes could close 380 power plants. Using these
methods to shut down the 600 most polluting coal-fired power plants in the
country would be a boon for public health.
Several European countries have begun to lead the transition away from coal.
(See data at www.earth-policy.org/Updates/Update42_data.htm.) In Germany, coal
use has been cut in half since 1990, while expanding wind electric generation
is taking its place. Coal use in the United Kingdom has dropped by 46 percent
over the same period, offset by efficiency gains and a shift toward natural
gas. Plans are moving ahead for a huge expansion in wind energy in the U.K.
and other European countries.
By moving beyond coal, the United States could avoid a legacy of smog-filled
skies, acid rain, polluted waterways, contaminated fish, and scarred
landscapes. This could each year save some 25,100 lives, reduce respiratory
and cardiovascular illnesses, avert potential neurological damage for 630,000
babies, and erase a health care bill of over $160 billion.
Research Associate
Earth Policy Institute
1350 Connecticut Ave., NW, Suite 403
Washington, DC 20036
jlarsen@earth-policy.org
Web site:
http://www.earth-policy.org