NATS 1840 - Lecture 1

NATS 1840 - Lecture 1 - NATS 1840 Lecture 1 Anthropomorphic...

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NATS 1840 – Lecture 1 – Anthropomorphic Extinctions in the Late Quarternary Human Impact on the Environment - There are many ways to measure human impact on the environment, the reduction of green space, the amount of pollution, the extinction of species - Species extinction is a rough measure at best, without details it is not possible to know if an extinction is due to our activities or something else environmental - In the case of recent extinctions, it is often easier to find the proximate causes of extinction, the removal of habitat, the introduction of predators, etc. - In the case of ancient extinctions, there can only be assumptions based on evidence - Still, the evidence for extinction, even if the causes are uncertain, is quite strong Martin’s Thesis Anthropogenic Sources of Extinction - Martin advances a novel thesis to explain why so many large mammals became extinct in the last 50 000 years (so called “near time”, also known as the Quarternary period) - Geological evidence indicates that we lost approximately half of our 200 genera of large mammals (100 lb +) in this period - Martin attributes almost all of the extinctions of wild animals in the last 50,000 years to anthropogenic causes, in other words due to human actions - The important lesson to learn from this point is that extinction is not a recent phenomenon, and it is not attributable to
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This note was uploaded on 09/30/2011 for the course NATS 1800 taught by Professor Jfdksoa during the Spring '11 term at York University.

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NATS 1840 - Lecture 1 - NATS 1840 Lecture 1 Anthropomorphic...

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