I've been aware of the many concerns about Roundup since the time I worked for BLM, and I've read various things on the subject in the interim. To my mind, there's plenty of reason for concern, and I choose not to use the stuff. But it's still one of the most widely used (probably the most widely used) herbicides, so it's obvious many people don't agree with my take on the subject.
http://roundupcompensation.com/
http://earthopensource.org/gmomythsandtr...easier-farmers/
http://robbwolf.com/2015/05/06/glyphosate-benign-or-dangerous/
http://www.mindfully.org/Pesticide/Roundup-Glyphosate-Factsheet-Cox.htm
http://npic.orst.edu/factsheets/glyphogen.html
http://www.pan-uk.org/pestnews/Actives/glyphosa.htm