Green Plumbing

Category - Caring for Our Planet

Which of the following is the largest US contributor of greenhouse gases related directly to human activity?
  1. Carbon dioxide
  2. Methane
  3. Carbon dioxide and methane equally
  4. 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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