问题详情

By“we don’t have 500 million years to wait”(Line 4，Para．6)，the author suggests that_____.
A.we have no enough time to allow the earth to recover from damages
B.we have no enough time to witness the evolution of a species
C.it’s urgent for humans to take steps to prevent global warming
D.its necessary for humans to stop maltreatment of the planet请帮忙给出正确答案和分析，谢谢！