在过去的100年里,人类变得更高、更胖,更长寿了。未来的人类将朝哪儿进化呢?从森林到草原700万年前,森林覆盖着非洲大陆。那时,人类的祖先生活在树上,他们的身体结构也适应在树上的生活。然而,随着地球气候的改变,非洲大地上的树木越来越少,开阔的大草原越来越多;环境的巨大变化迫使人类的祖先从树上下来,开始在平坦的大草原上活动。 Over the past 100 years, humans have become taller, fatter and longer. Where will future humans evolve? From forests to grasslands Seven Million Years ago, forests covered the continent. At that time, the ancestors of mankind lived in the tree, and their physical structure also adapted to life in the tree. However, as the Earth’s climate changes, fewer and fewer trees are found on the land of Africa and more and more open prairies. Huge changes in the environment have forced human ancestors to descend from the trees and begin activities on flat prairies.