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dead and diseased trees surrounding the healthy genetically engineered trees. >> and it grew beautiful. absolutely beautiful. and even to this day, there has been no breakdown of resistance. >> reporter: today american farmers grow about 10 different gmo crops including more than 92% of all corn and soy. most are engineered to ward off insects or to resist weed-killing herbicides or both. that means, farmers can dramatically reduce insecticide use and when they spray for weeds, the herbicide won't kill their crops. and most of us eat gmos every day in processed foods like soda, cereal, chips, and cheese. and in november, salmon joined the list. it is genetically engineered to grow faster.

pipeline. among them, a peanut, without the toxin that triggers deadly allergies. bananas, the main n urce of food for hundreds of millions of africans, that would become immune to diseases now decimating those crops. >> hell, no, gmo! >> hell, no, gmo! >> reporter: so given all that, why are so many people so opposed to gmos? >> as a mother, and a scientist who has been looking at these, use for some decades, i am increasing concerned at the way corporations have gained more and more control and influence over our food system. >> reporter: she is a senior scientist at pesticide action network.

responsible for an enormous increase in the use of pesticides primarily herbicides. weed killers. people have a healthy skepticism to corporations telling us that their products are perfectly safe. we have seen that with ddt and tobacco for example. >> reporter: a lot of the opposition to gmos directed at the world's largest seat company, monsanto. the scientist says she is troubled that when farmers buy herbicide-resistant gmo seed from monsanto they're locked into using large quantities of monsanto produced herbicide as well. and there is something else. farmers who buy monsanto's patented gmo seeds must sign an agreement promising that they will use them for only one harvest or be sued. farmers have done this since the beginning of farming. they raise their crops. save their seeds. and plant them the next year. so why push farmers not to replant seeds that are patented by monsainto from this year to next year? >> we spend a billion and a half

some way of seeing a return on that. >> reporter: hugh grant is the ceo of monsanto. he says if farmers want to take their business elsewhere they have plenty of options. >> the grower has very little loyalty, very little from the best possible seed that produces the best possible crop. >> reporter: those crops are getting harder to sell. as consumes say they dent want gmos in their food. >> i want to say, no to gmo. and yes to healthy foods. >> we have no idea what potential health complications arise from eating diets richt in gmos. >> reporter: and some companies are reacting. chipotle, hershey, and whole foods, have or will soon ban or require the labelling of all

the big question is -- is all of this fear justified? >> researchers are only just beginning to investigate the myriad of potential adverse health effects. >> reporter: like what? >> from gmos. the issue is we don't have the long term independent studies to be able to answer these questions fully. >> reporter: and this its the great divide. polls show 57% of americans think gmos are unsafe to eat. but consider this. 88% of scientists say, gmos are safe. and, prestigious scientific organizations, among them, american medical association, the world health organization, and the national academy of sciences, all say hundreds of peer reviewed studies confirm, gmos pose no danger to health.

husband is a certified organic farmer. >> reporter: has any study shown even as much as one person who has been harmed or died from eating food that was genetically engineered? >> there is not a single instance of harm to human health or the environment using genetically engineered crops. >> reporter: she points out that farmers have been genetically altering food for thousands of years using techniques like grafting, hybridization, and cross-breeding. look at corn for example. >> this is modern sweet corn. this is the ancient ancestor of de cn. this corn produces 100 fold more grain than ancient ancestor which is not used anymore. nothing we eat has been engineered by nature. everything we eat has been genetically altered using human intervention.

majority of americans say, gmos are different and should be clearly labeled. >> since the food are not labeled, we have no way to really ascertain what are the kind of impacts that people are having who are consuming gmos and those who are not. americans have a right to know what is in our food. and a right to know how it has been grown. >> reporter: and she has an unlikely ally. the ceo of monsanto. >> we have been for voluntary labelling for quite some time. >> reporter: i am surprised i would think if there is one company that didn't want people to have gmo on a label when they walk through a grocery store, it would be monsanto. >> if we are going to be transparent we should really open up. to me that makes sense. >> reporter: what no one disputes is this. the controversy over gmos is creating an ever-lengthening approval process in countries around the world. take vitamin enriched golden rice which could help 250

sometimes fatal vitamin a deficiency. >> we have to have food that is safe. what has been put into the golden rice, a pigment we should eat every day in carrots. as we impose regulatory hurdles that are not placed on other crops, many children are dying every day. >> reporter: faced with increasing anti-gmo public opinion, the push to ban them is accelerating in rich countries. where there is so much food that obesity is a major health issue. yet their biggest impact could one day be in the increasingly hungrd w itriplon sup fo joi

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