For the past four years, Colombia's anti-drugs police, backed by the United States, have tried to eradicate coca-growing in its southern jungles. Chemicals are being sprayed to eradicate the crop.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/herbicide-versus-market-forces
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/economist-london
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture