With the increase of the population, we have an influence the weather a lot way beyond our imagination, especially through our industrial activities. We need more lands, so we encroach on forests, lakes, wetlands etc. while those are really beneficial to the earth. There are several things we can do: First, we need to focus on the development of technology, for example, try to improve the yield of the farms, instead of just expanding their surface. Second, every citizen has the obligation to protect the earth, we should choose a more environmentally friendly lifestyle. Individuals can make a difference.