PART ONE: First Things First: Beginnings in History, to 500 B

1. three factors have magnified the human impact on the earth a. world population quadrupled in the twentieth century. b. massive use of fossil fuels (coal in the nineteenth century, oil in the twentieth) c. enormous economic growth. 2. uneven spread of all three over the world. a. but economic growth came to appear possible and desirable ... ................
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