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Since the rise and spreading dominance of Homo sapiens, we have become the most powerful, creative, and ultimately destructive life form on the planet. The rate of human caused plant and animal extinction has accelerated tremendously in the last 500 years. Many scientists believe we have entered a sixth great extinction period that rivals the last one, which killed off 76% of Earth's species. This class will examine species that have already become extinct during the present epoch, along with those so critically endangered that they may be gone in the next 50 years. We will also look at species that have been brought back from the brink, and discuss what must be done to save others.