Today it is possible to directly alter the genes of organisms. Transgenic plants carry a foreign gene that has been introducted other into their cells so that they have new and different traits.
Cotton, corn, potato and soybean plants have been engineered to be resistant to either insect perdition or herbicides that are judged to be environmentally safe. Some corn and cotton plants have been produced that are both insect and herbicides resistant. In 1999, transgenic crops were 'planted on more than 72 million areas world wide and the average is expected to triple in about five years. If crops are resistant to a broad spectrum herbicide then the herbicide can be used to kill the weeds. When herbicide resistant plants were planted, weeds were easily controlled less till age was needed and soil erosion was minimized.
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