If you enjoy breathing as much as I do, this story should be cause for concern.
Toxins spilling into the Gulf of Mexico from the swollen Mississippi are choking off the water's oxygen at a record pace this spring, leaving a larger than ever oceanic "dead zone" of lifeless water.
The toxins – primarily agricultural chemicals such as nitrogen fertilizers and pesticides, as well as automobile exhaust and sewage runoff – are killing tiny zoo- and phytoplankton (the little critters who supply about 70% of the earth's oxygen), and driving away larger sea life.
http://www.care2.com/causes/environment/blog/ocean-dead-zone-larger-than-ever-and-growing
