NATS 1840 - my Lecture 1 - summary

NATS 1840 - my Lecture 1 - summary - NATS 1840 Lecture 1...

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NATS 1840 – Lecture 1 – Anthropomorphic Extinctions in the Late Quarternary Human Impact on the Environment Technology affects environment. Methods to measure human’s impact on environment are: number of trees we cutting down , pollution we make, extinction of species (we look at this). Species extinction is rough. What it means is that it can be due to many reasons why a species becomes extinct. So species extinction is not an exact measurement of human activity because extinction occurred due to many reasons. If recently a group of fish become extinct: we can find more easily the causes of extinction because the causes are still around. Post extinction is harder to understand because the causes have been gone. Although for post extinction we use guessing, there are some evidence of cause of extinction as well (but there are a lot of disagreements) - Green space, pollution, extinction - Causes of extinction, removal of habitat, predators - Evidence for extinction, evidence for causes Martin’s Thesis Anthropogenic Sources of Extinction According to Martin the last extinction occurs because of humans. He explains how humans just by using arrows make a species extinct. He focuses on large animals. - Many large mammals (almost ½) became extinct in the last 50 000 years ( “near time”, Quarternary period) - Approximately half of 200 genera of large mammals (100 lb +) lost - Almost all extinctions of wild animals in last 50,000 anthropogenic If the cause is anthropogenic it means that we did it. - Extinction not only recent, not solely due to advanced science or technology Extinction is not the recent phenomenon. In fact, extinctions happened even before humans’ appearance. Martin said that extinction has been occurring naturally but humans contribute to it as well.
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