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Green Plumbing

Category - Caring for Our Planet

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Which of the following is the largest US contributor of greenhouse gases related directly to human activity?

Carbon dioxide
Methane
Carbon dioxide and methane equally
Neither carbon dioxide nor methane

Explanation

Answer: A - Carbon dioxide is by far the largest contributor of greenhouse gases in the US among those generated by human activity. It accounts for over three-quarters of human-generated US greenhouse gas emissions, with methane in a distant second place.

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