Mounting evidence suggests even the tiniest amounts of arsenic can boost your risk of developing cancer. But some scientists think that evidence is overblown. This article takes a close look at the controversy.
Pervasive in the developing world, moldy crops threaten millions with cancer and other illnesses.
Brick making supplies jobs and pollutes the air in the world’s poorest economies.
For centuries miners have used mercury to trap particles of precious metals. Artisanal and small-scale gold miners used an estimated 1,400 metric tons of mercury in 2011. About one-third of the mercury used is believed to go into the air while the rest goes into soils and waterways.