The environment ministry declared the emergency in 11 jungle districts near Peru's border with Brazil, after hair samples from local people revealed levels of mercury up to 16 times what is considered safe.
The daughter of imprisoned former hardline president Alberto Fujimori, Keiko is almost sure to win the vote but unlikely to obtain the 50 percent she would need to avoid facing the second-placed candidate in a runoff vote on June 5.
Sand and gravel are the most-used natural resource after water — and the world consumes annually twice the amount of sediment carried by all the Earth's rivers.
Miguel, a Mexican iron ore miner, told us Chinese and Korean companies are paying millions of dollars a month to the Knights Templar cartel.
In Donbas, Eastern Ukraine, you spend the day hacking away inside a pitch-black, kilometer-deep tar hole, breathing in exposed coal and methane.
The industry is hurting, which is evidence that new busts are working.