06 Dec 2010:
Coal-based Pavement Sealant
Is Leading Source of Toxin in U.S. Lakes
A coal-based sealant sprayed on pavement for parking lots, playgrounds, and driveways is the leading contributor of a toxic pollutant found in U.S. lakes and reservoirs
, according to a new study. Samples of sediments collected from the bottom of lakes and reservoirs in 40 urban areas by the U.S. Geological Survey revealed high levels of polycyclic aromatic hydrocarbons (PAHs), a probable carcinogen that is also toxic to fish and other marine life. On average, about half of the PAHs came from coal-tar sealants. Vehicles account for about one-fourth of the remaining pollutants, and coal combustion contributes about 20 percent, according to the study, published in the journal Science of the Total Environment
. Coal-tar pavement sealants — derived from the waste produced in the coking of steel — have been banned in several U.S. cities, including Austin, Texas, and Washington, D.C. An alternate asphalt-based sealant contains levels of PAHs that are 1,000 times lower than coal-tar sealants
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Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.
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The 2015 Yale e360 Video Contest winner documents a Northeastern town's bitter battle over a wind farm. Watch the video.
A 2015 Yale e360 Video Contest winner captures stunning images of wild salmon runs in Alaska. Watch the video.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
video goes onto the front lines with Colorado firefighters confronting deadly blazes fueled by a hotter, drier climate. Watch the video.
A three-part series Tainted Harvest
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