Modern biotechnology likewise employs living organisms to make or modify products. But unlike traditional methods, modern biotechnology allows for modifying the genetic material of organisms directly and precisely. It enables the transfer of genes between completely unrelated organisms, allowing for combinations unlikely to occur by conventional means. Breeders can now take qualities from other organisms and put them into the genome of a plant—for instance, frost tolerance from fish, disease resistance from viruses, and insect resistance from soil bacteria.

Suppose that a farmer does not want his potatoes or apples to turn brown when they are cut or bruised. Researchers come to the rescue by removing the gene that is responsible for this browning and replacing it with an altered version that blocks browning. Or let us assume that a beet grower would like to plant earlier in order to reap a better harvest. Ordinarily he couldn’t because the beets would freeze in the cold weather. Biotechnology comes into play when genes from fish that easily survive in cold water are transplanted into the beets. The result is a GM beet that can withstand temperatures as low as 20°F. [-6.5°C], more than twice as cold as the lowest temperature beets can typically withstand.
Such traits that are the result of single-gene transfers, however, have limited effectiveness. To alter more complex traits,
such as growth rate or drought resistance, is quite another matter. Modern science is still unable to manipulate whole groups of genes. After all, many of these genes have not even been discovered yet.

Even as you read these lines, such GM crops as soybeans, maize, rapeseed, and potatoes are growing in Argentina, Brazil, Canada, China, Mexico, and the United States. According to one report, “by 1998, 25 percent of corn, 38 percent of soybeans, and 45 percent of cotton grown in the United States were genetically altered, either to make the crops resistant to weedkillers or to produce their own pesticides.” By the end of 1999, an estimated 100 million acres [40 million ha] were covered with GM crops in commercial cultivation worldwide, though not all of these are food crops.

Is genetically altered food safe for you? Do the scientific techniques used to produce GM crops pose any threat to the environment? In Europe the debate over GM foods is heating up. Said a protester from England: “My only objection to genetically modified foods is that they’re unsafe, unwanted and unnecessary.”

So far so good. But does meat from animals that are fed these additives carry any risk to the consumer? A report by the Economic and Social Committee of the European Communities concluded that there is a chance that bacteria will survive the antibiotics and be passed on to the consumer. “Some of these bacteria, such as Salmonella and Campylobacter, may be a direct cause of severe human diseases via the food chain,” the report found. Furthermore, what if the food chain contains not only bacteria but also residues of antibiotics? Fears have been raised that as a result, germs causing diseases in humans could gradually develop a resistance to antibiotics.