世纪之交,回顾过去,展望未来,人类的生存环境、城市的发展问题是摆在我们面前的重大课题。随着城市化进程的加快,城市环境日益恶化,生态遭到破坏,“城市病”频频出现,危及到居民的健康和城市的可持续发展。久居闹市的人们渴望亲近自然。城市不仅需要气势磅礴的高楼大厦、纵横交错的立交桥、五彩缤纷的霓虹灯,还需要碧水、蓝天、绿 At the turn of the century, reviewing the past and looking forward to the future, the living environment of mankind and the development of cities are major issues before us. With the acceleration of urbanization, the deteriorating urban environment and the destruction of ecology have brought about frequent occurrence of “urban diseases”, endangering the health of residents and the sustainable development of cities. People living in downtown desire to be close to nature. The city not only needs magnificent high-rise buildings, criss-cross overpass, colorful neon lights, but also requires clear water, blue sky, green