¿por que hasta la década de 1990 ningún país había iniciado exploraciones en el ártico?

Answer the government provides "unemployment insurance"

Its led to migrationits led to death 

When a lake, river or other aquatic  system  becomes  eutrophic, it can have serious negative effects on other organisms like fish, birds and even people.if an algal bloom is so bad that it causes wide-spread death  in  the  water, the organisms that die will all sink to the bottom and start to decompose.

Can you maybe send me a screen shot of the map? it would really me you. : )