There are many longer term (millions of years and more) variations in climate re

Question

There are many longer term (millions of years and more) variations in climate recorded in Earth history and these include the transition from not having any ice ages prior to about 2.6 million years ago to alternating ice ages and interglacial periods since then. Which of the following is most likely to cause such longer-term climate shifts on this planet (circle best answer):

(a) human activity

(b) sun spot activity

(c) alien manipulation of Earth climate

(d) plate tectonic transitions, such as the growth of a mountain range or rearrangement of land masses,

(e) solar eclipses

(f) lunar eclipses.

Explanation / Answer

(a) human activity because the evolution of Human beings statrted from 2.6 million years.

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