A. Human Activity
"According to the National Climate Assessment, human influences are the number one cause of global warming, especially the carbon pollution we cause by burning fossil fuels and the pollution-capturing we prevent by destroying forests. The carbon dioxide, methane, soot, and other pollutants we release into the atmosphere act like a blanket, trapping the sun's heat and causing the planet to warm. Evidence shows that 2000 to 2009 was hotter than any other decade in at least the past 1,300 years<span>. This warming is altering the earth's climate system, including its land, atmosphere, oceans, and ice, in far-reaching ways."
https://www.nrdc.org/stories/are-effects-global-warming-really-bad
Hope this helps!</span>
Answer
Explanation:
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<span>A. A star 2.5 light years away
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Hello! The answer to your question would be as followed:
The answer that is not a duty of a U.S Citizen is <u><em>D. learning about and understanding foreign governments and laws</em></u>
A citizen duty is rights and responsibilities a citizen must follow. They are most important and can help you a good citizen. As what A, B, and C state, those answers are all morals while for an answer like D. is yes moral but not important.
