Information about dangers of herbicides and pesticides
Resources and more information:
spcpweb.org
safelawns.org
beyondpesticides.org
Toxicity of herbicides:
http://ipm.illinois.edu/pubs/iapmh/11chapter.pdf
http://www.mindfully.org/Pesticide/Clopyralid.htm
http://www.motherearthnews.com/Grow-It/Milestone-Herbicide-Contamination-Creates-Dangerous-Toxic-Compost.aspx
Resistant weeds: http://www.sciencenews.org/view/generic/id/330904/title/Weeds_increasingly_immune_to_herbicides_