Why does tropical deforestation lead to more extinction than did deforestation of the USA?
a. The world has changed, and there are now many more people on Earth, so that the forests are less able to deal with deforestation. b. There are typically many more species per acre of tropical rain forest than there are per acre of temperate rain forest. c. The species didn t start going extinct until the last forested areas started to be cut down. d. Tropical species are more adaptable than temperate species. 39. The atmospheric abundance of carbon dioxide (CO2) is increasing because of human activities. Which of the following human activities does not add CO2 to the atmosphere? a. Driving a sport-utility vehicle. b. Burning coal in an electic plant. c. Burning down forests and replacing them with cattle pasture. d. Using fission reactions in a nuclear power plant. 40. Roughly how much has the average surface temperature of the earth increased over the last century? a. Not at all. b. 0.5° F c. 5° F d. 10° F 41. Why is increasing atmospheric CO2 thought to be responsible for global w
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