Artificial Selection

I am in the middle of designing a lesson on Natural vs. Artificial Selection. In an attempt to find some examples of artificial selection I started looking at a variety of websites and journal articles. What I found was shocking! Of course, the obvious examples of artificial selection is selective breeding in dogs and other household pets, as well as horse breeding in race horses. What I was not prepared for was the extent to which the food we eat is genetically modified. Humans are changing the natural course of evolution to benefit themselves. We genetically modify the food we eat for our nutritional benefit and animals for our enjoyment and entertainment. So, I began to wonder; is all this genetic modification going to ruin natural selection and cause issues with the evolution of entire ecosystems? The answer to this question will require much more research, but the real question is, has anyone (scientists etc..) ever posed it? What do you think?

Check out this informational slide show:
Artificial vs. Natural Selection