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Why are there different theories about the effects of global warming? a. There is no data to support global warming. b. Global climate is complex, so changes in global climate are hard to predict. c. Increased levels of carbon dioxide are offset by other changes. d. There has been a decrease of extreme weather.

b

User Keith OYS
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Option B:
Global climate is complex, so changes in global climate are hard to predict.
User AJ Zane
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