Why was the concern over global cooling replaced with a concern over global warming?a.The science community needed a cause to frighten the general population.b.Steady surface temperature increases were noted between the 1970’s and 90’s.c.Air pollution only became a concern in the 1980’s.d.Scientists observed severe ocean acidification.
Between 1940 and 1970 most scientists were already concerned about global warming.
Which of the following best explains why air pollution that was once blamed for global cooling is now considered responsible for global warming?a.Pollution began reflecting sunlight and heat rather than absorbing it.b.Evidence of global warming became overwhelming.c.Scientists mistakenly thought pollution reflected sunlight and heat rather than absorbed it.d.Congress required scientists to assign a cause to global climate change.
Global warming is a theory accepted by a majority of scientists.
Which of the following is not a manmade cause of global warming?a.burning fossil fuelsb.deforestationc.respirationd.population growth
Which of the following best describes the impact of glaciers upon the surface of the earth?a.Ice buried continents under a few hundred feet of ice.b.Glaciers scraped across the surface and altered landscapes and the course of rivers.c.The passage of glaciers created new ecosystems.d.All of the above.
Africa was covered by glaciers during the Pleistocene ice age.
Greenhouse gases are essential to support life on earth.
Which of the following is not a theory supporting global warming? a. It is predicted that the average temperature will rise 1.4° C or more over the next 100 years. b. Human activity has increased greenhouse gases. c. Over the last 100 years the earth has warmed by 0.74° C d. Carbon dioxide is an insignificant greenhouse gas. Please select the best answer from the choices provided
“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? a. Most climate scientists dispute the theory of human influence on global warming. b. Global warming is most likely alarmist propaganda based on false data. c. Global warming is definitely not caused by human influence on nature. d. Most climate scientists believe that there is evidence that explains global warming. Please select the best answer from the choices provided
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