It's called "Minamata Treaty" after Minamata disease (a neurological disease caused by severe mercury poisoning) was first discovered in the city of Minamata, Kumamoto Prefecture, Japan, in 1956.
Mercury and most of its compounds are extremely toxic (Hg is toxic in metal, vapor, salt, and organic compounds). Mercury is bioaccumulating heavy metal very harmful for people. Athmospheric mercury may be inhaled, but even if it falls into oceans and farmland it bioaccumulates and moves up in the food chain. Eventually into fish and people.
Mercury and most of its compounds are extremely toxic (Hg is toxic in metal, vapor, salt, and organic compounds). Mercury is bioaccumulating heavy metal very harmful for people. Athmospheric mercury may be inhaled, but even if it falls into oceans and farmland it bioaccumulates and moves up in the food chain. Eventually into fish and people.