suggest two ways in which human activities contribute to an abnormal rise in levels of atmosphere carbon dioxide

Consuming electricity and Transportation

Explanation:

Consuming electricity: Burning fossil fuels emits CO2, with coal releasing twice as much of the gas as petroleum.

Transportation: Whether for business or pleasure, locomotion is the second largest source of U.S. CO2 emissions.

not only is it colder, it also becomes darker, less salty, and more dense.

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