Question

Which of the following statements is (are) true about global warming?

A. The earth has already warmed by between 0.6 and 0.9 degrees Celsius over the past century.

B. Burning fossil fuels is the leading contributor of global warming.

C. The amount of greenhouse gases in the atmosphere has increased by as much as 25 percent since the Industrial Revolution.

D. All of the above.

Answer

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