I recently read an article from LA Times regarding the decline of the monarch butterfly population. According to Richard Fausset’s article released on March 13 like around five-thirty in the afternoon, the large decline of monarch butterflies (shrank 59%) is due to the dramatic changes in the weather happening in the United Sates as well as the loss of habitat in the U.S Corn Belt. Tourism in Mexico is starting to be affected because states like Michoacan and the capital of Mexico rely on the butterflies as a tourist attraction. However, studies have also shown that the herbicide glyphosate has been used in the U.S where the butterfly feeds and breeds.
http://www.latimes.com/news/nationworld/world/la-fg-mexico-butterflies-20130314,0,1884525.story