Roundup Safety is a Myth
This article by the Pesticide Action Network spells out in detail many of the health and safety issues related to Roundup: http://www.pananz.net/roundups-not-ok.php.
Among the topics covered in the article are: poisonings and symptoms; acute toxicity; long-term toxicity; cancer, genotoxicity, endocrine disruption, reproduction; neurological and other effects; as well as environmental effects on soil and water.