Scientists have not been able to link increases in carbon dioxide directly to human activities.
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Q20: Climate scientists say the planet is heating
Q21: Effects resulting from climate change that scientists
Q22: Climate change and global warming are controversial
Q23: Reductions in the burning of fossil fuels
Q24: The evidence that global warming is human-caused
Q26: Heilbroner writes that humans care a great
Q27: Heilbroner believes that rational arguments can have
Q28: Gardiner believes that the global environmental tragedy
Q29: Gardiner's "perfect storm" metaphor involves the unusual
Q30: Once emitted, molecules of the main greenhouse
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