Genetically modified (GM) crops have greatly advanced agricultural production and reduced the use of pesticides. These crops incorporate DNA from another organism, often bacteria, to gain advantage from a protein coded by a gene on this DNA. Many GM crops are grown in the USA and you eat GM foods frequently. I Europe, GM crops are basically banned because of environmental and health concerns. The following two websites will give you a brief overview of the issues with GM crops and foods, but feel free to look at more websites on this topic.

http://www.geneticallymodifiedfoods.co.uk/fact-she…

http://www.buzzle.com/articles/genetically-modified-foods-pros-and-cons.html