Question

What is global warming?

a) a recent increase in the average global temperature near Earth’s surface
b) a period of time when temperatures across the planet are colder than normal
c) a characteristic of summer that returns seasonally
d) the gain of heat in coastal areas from El Niño storms

Answer 1

a

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Answer 2

Global Warming is a gradual increase in the overall temperature of the earth's atmosphere.

So, i believe the answer to your question would be a) a recent increase in the average global temperatures near Earth's surface