Humans have been damaging the environment for centuries by overcutting trees and farming too intensively, and though some protective measures, like the establishment of national forests and wildlife sanctuaries, having been taken decades ago, great increases in population and in the intensity of industrialization are causing a worldwide ecological crisis.
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Athough some protective measures, like the establishment of national forests and wildlife sanctuaries, having been taken decades ago, great increases in population
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Bthough some protective measures, such as the establishment of national forests and wildlife sanctuaries, were taken decades ago, great increases in population
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Cthough some protective measures, such as establishing national forests and wildlife sanctuaries having been taken decades ago, great population increases
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Dwith some protective measures, like establishing national forests and wildlife sanctuaries that were taken decades ago, great increases in population
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Ewith some protective measures, such as the establishment of national forests and wildlife sanctuaries, having been taken decades ago, great population increases
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