Which of the following continents was not covered by ice during the Pleistocene ice age?
Which of the following best explains why air pollution that was once blamed for global cooling is now considered responsible for global warming?
Greenhouse gases are essential to support life on earth.
Between 1940 and 1970 most scientists were already concerned about global warming.
Which of the following best describes the impact of glaciers upon the surface of the earth?
Global warming is a theory accepted by a majority of scientists.
Human activities _______.
During ices ages our planet supports more glaciers and deserts than forests.
Greenhouse gases are best described as _______.
“In a 2009 study, presented by the National Academy of Science, 97% of climate scientists agree that human activity is causing global warming." Which of the following statements is best supported by this study?
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