Check this out. I ran across this article on www.deadlinelive.info
I don't know how true this story is, or exactly who the sources are but this article is worth reading.
(NaturalNews – Phil Pepin) A shocking statistic was found in a report from the U.S. Geological Survey, a study of pesticide and herbicide use from 1992 to 2012. During the two decades, an estimated 2.6 billion pounds of Monsanto’s glyphosate-based herbicide was used on America’s agricultural land. It’s been the primary herbicide used with genetically engineered crops since mid-1990s when Monsanto introduced their “Roundup Ready” corn and soybeans.
A time-lapse video with a map of United States, used in the Environmental Working Group (EWG) article “2.6 Billion Pounds of Monsanto’s Glyphosate Sprayed on U.S. Farmland in Past Two Decades,” shows the dramatic spread of the use of Roundup..