There is no doubt that human activity has an effect on the planet.We see the evidence of mankind’s endeavors all around us.While some of man’s accomplishments, such as the building of transportation systems and the consistent supply of potable water, have made Earth a better place for people to live, they have not come without cost.Overall, it seems that human activity harms the Earth more than it benefits it.

　　人类活动无疑会对地球造成影响。我们周围随处可见人类活动的迹象。虽然人类某些成就，如运输系统的建立以及饮用水持续的供应等，使得地球成为一个更适合的人类居住的地方，但这些成就的取得也付出了代价。总体上，对地球而言，人类的活动似乎弊多于利。