Between 1940 and 1970 most scientists were already concerned about global warming.
Which of the following is not a manmade cause of global warming?
Human activities _______.
Greenhouse gases are best described as _______.
Why was the concern over global cooling replaced with a concern over global warming?
Global warming is a theory accepted by a majority of scientists.
Which of the following is not true concerning the interglacial period that began 15,000 years ago?
Which of the following continents was not covered by ice during the Pleistocene ice age?
Africa was covered by glaciers during the Pleistocene ice age.
Which of the following is not a theory supporting global warming?
During ices ages our planet supports more glaciers and deserts than forests.
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