Why cant microbes that naturally clean up the environment

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1.) Are all attempts to recreate an ecosystem doomed to failure?
2.) Why can't microbes that naturally clean up the environment continue to do so as in the past? How have humans made their task harder? Easier?
3.) Why do human beings play a unique role both in the degradation and the preservation of biosphere?
4.) Do you think humans can change the behaviors leading to disruptions in the environment?

Reference no: EM1397924

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