In the largest and most comprehensive assessment to date of hundreds of U.S. landfills, scientists from Arizona State University, who are part of a research collaboration with Carbon Mapper, have discovered that many landfills in the U.S. are releasing high volumes of methane and are responsible for a disproportionately large share of pollution from this important sector.

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Arsenic is a toxic metalloid of natural origin. Arsenic-contaminated soils and waters are found all over the world, especially in southeastern Asian countries like Bangladesh, Vietnam, and China.

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