ENVI 201 Lecture Notes - Lecture 18: Eutrophication, Bladder Cancer, Nitrogen Cycle
12 Apr 2017
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Document Summary
Gulf of mexico extreme case of cultural eutrophication. Nitrates discharged from the mississippi have nearly tripled since 1950. 1960s - many areas with cultural eutrophication. 1972 - canada and the us great lakes pollution control program. Water can get contaminated and we may not even know. China gets 70% of the country"s drinking water from groundwater. 9/10 aquifers in china are polluted or overexploited. Source of drinking water for about half of the us population. Very energy intensive and created a lot of waste. Us has the world"s cleanest drinking water. 54 counties have standards for safe drinking water. The us safe drinking water act required the epa to establish minimum contaminant levels for pollutants that may adversely affect human health. Can lead to skin, lung, bladder cancer. Rocks rich in arsenic can contaminate wells. There are many ways to purify drinking water. Expose clear plastic containers to sunlight (uv) Pur - chlorine and iron sulfate powder.
