It’s hard to imagine a way in which stem cell research can negatively affect the environment. Perhaps if our ability to repair and replace muscle tissue and nerve-cells became so advanced that most humans lived very, very long lives and reproduced at the current rate, then problems associated with overpopulation would become so staggering that our environment would be negatively affected. Otherwise, there is not much of a chance for outbreak or anything devastating as the process only involved cells that have not been differentiated, in other words, there is no abnormal genetic modification (that could cause disease or an outbreak) associated with stem cell research.
Research that does negatively affect the environment is much more energy intensive—the space program, engine testing and development, and particle accelerators all use way, way more energy than the earth can sustain indefinitely (as well as our current rate of fossil fuel consumption—but we have plenty of stem cells to go around; in fact, they used to be just discarded every time there was a birth). The hope (for the space program and the tests run by the physicists operating the Hadron Collider and the like) is that the benefits will exceed the costs.
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