The energy-related usage in the United States makes up nearly the percentage of human-caused greenhouse emissions is 57%. Thus, option "A" is correct.
The earth has a natural greenhouse effect that comes from natural events like volcanos that spew gases such as carbon dioxide into the atmosphere. Even wildlife and bacteria produce carbon dioxide and methane from respiration.
These greenhouse gases maintain are relatively safe greenhouse effect that keeps the planet warm. Without the greenhouse effect, the earth’s average temperatures would be -18 degrees centigrade. The greenhouse gases are regulated by uptake b carbon sinks like forests.
Thus, option "A" is correct.
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