In the lecture, what do the Ice Age and the creation of the Sahara Desert both illustrate

In the lecture, what do the Ice Age and the creation of the Sahara Desert both illustrate about past climate changes？ Choose 2 answers.

A．That some climate changes benefitted the development of civilization

B．That some climate changes were not caused by human activity

C．That some climate changes were caused by a decrease of moisture in the atmosphere

D．That some climate changes were caused by changes in Earth"s motion and position

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！

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