oil pollution: the Exxon Valdez disaster in 1989  

Exxon Valdez
Tugboats pull the crippled tanker Exxon Valdez.

oil pollution: the BP deepwater horizon oil rig spill in 2010:

BP DeepWater Horizon

polluted drinking water tragedies in two cities: Flint, Michigan and Walkerton, Ontario:

managing our waste water:

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