Why has the earth experienced natural climate changes?

A. The earth has experienced natural climate changes because of rapid deforestation of the tropical rainforest.
B. The earth has experienced natural climate changes because of increased burning of fossil fuels.
C. The earth has experienced natural climate changes because of the variability in solar irradiance, as evidenced by sun spot activity.
D. The earth has experienced natural climate changes because the increased number of asteroids between the earth and the sun is blocking the amount of solar radiation the earth receives on an annual basis.
E. In cycles of tens or often hundreds of thousands of years, the earth’s tilt and its orbit around the sun gradually change. These natural changes have contributed to dramatic shifts in earth’s climate.


Ans: E. In cycles of tens or often hundreds of thousands of years, the earth’s tilt and its orbit around the sun gradually change. These natural changes have contributed to dramatic shifts in earth’s climate.

Environmental & Atmospheric Sciences

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