The Sun is gradually increasing in luminosity as it ages. It is about 30% more luminous than it was when it was born. Why isn't this increase considered to be an explanation for global warming?
A) The Sun is increasing in luminosity way too slowly, over many millions of years.
B) What the Sun was doing millions of years ago is what determines Earth's temperature, since the Earth doesn't respond directly to what the Sun is doing today.
C) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does.
D) The scientists are covering up this potentially valid explanation.
A) The Sun is increasing in luminosity way too slowly, over many millions of years.
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Fill in the blank(s) with correct word
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