We think that an increase in the length of the dry season sometime after 27 million years ago caused the loss of those plant groups on the Ethiopian Plateau.
我们认为2700万年前之后某个时间旱季长度的增加导致了埃塞俄比亚高原上那些植物群落的消失。
2
Further analyses show the variation of earth rotation rate and sunspot cycle length have important role on the climate abrupt change in the Qinghai-Xizang Plateau.