Day 20: Nitrates

Although the health effects of nitrates on humans are limited, their environmental effects are considerable.  When discharged into streams, rivers and lakes (usually via runoff from agricultural land), nitrates promote bacterial growth which consumes oxygen in water (a condition known…

Day 18: Arsenic

A 2007 study concluded that over 137 Million people in more than 70 countries suffer from arsenic poisoning in drinking water.  It can cause headaches, confusion, severe diarrhea and drowsiness in mild cases, but at high concentrations will cause committing,…

Day 16: Mercury

Mercury is a metal that occurs in liquid form (sometimes called quicksilver) that can cause serious health problems.  In the form of methylmercury, which is widely present in the environment and often consumed in fish and shellfish, it can cause…