Urban Sprawl

     With increasing population, human gradually expand their living areas. The urban sprawl destroys forests and causes grasslands desertification. Trees are the only green things. They can purify airs. Without urban sprawl, maybe our trees should grow up in the forest. The increasing people pollute the airs. The increasing emission of green gases makes the plants in the urban more and more precious. Firstly, green plants can absorb noise. Secondly, green plants can absorb dust. Eventually, they can emit oxygen. Thus, urban needs more and more green plants. Protecting nature is to protect human ourselves. We should protect environment and cherish life.