What is a drawback of increased economic activity?

He want to contact the red cross/red crescent because they are the main non profit organization that deals with disasters around the world 

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.