If you are meat eater, you should surely check this out. Be warned, its a little disturbing, but *true*.
Also what you need to know about Livestock Farming/Breeding and it’s effects on the environment you have to check these links:
http://www.nrdc.org/water/pollution/ffarms.asp
http://www.nrdc.org/water/pollution/nspills.asp
Google for Livestock pollution and you would get plenty of matching results.
EAT Healthy and natural Food, and save the environment.
Do your bit.