Researchers at the Savannah River Ecology Lab (SREL) have pointed out that approximately 120,000,000 tons of coal fly ash, a by-product of coal burning, are produced each year just in the U.S. Coal ash waste contains metals such as arsenic, copper, and selenium, which may be toxic at high concentrations.
(selenium; may be; toxic) (Researchers at the Savannah River Ecology Lab; have pointed out; that approximately 120,000,000 tons of coal fly ash, a by-product of coal burning, are produced each year just in the U.S. Coal ash waste) Context(Researchers at the Savannah River Ecology Lab have pointed out,List([0, 69))):(approximately 120,000,000 tons of coal fly ash, a by-product of coal burning; are produced; T:each year; L:just in the U.S. Coal ash waste)
Researchers at the Savannah River Ecology Lab have pointed out,List([0, 69))
selenium Researchers at the Savannah River Ecology Lab approximately 120,000,000 tons of coal fly ash, a by-product of coal burning
may be have pointed out are produced
toxic
that approximately 120,000,000 tons of coal fly ash, a by-product of coal burning, are produced each year just in the U.S. Coal ash waste
T:each year L:just in the U.S. Coal ash waste