Question

The present warming of the Earth is largely caused by man as
there has been no activity utilizing sun’s energy.
there has been no earth’s natural cooling or warming.
there has been an increase in CO2 in the atmosphere.
None of the above

Answer 1

Answer:

Explanation:

How do we know? Scientists agree that global warming is caused mainly by human activity. Specifically, the evidence shows that certain heat-trapping gases, such as carbon dioxide, are warming the world—and that we release those gases when we burn fossil fuels like coal, oil, and gas.