问题详情

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！