as we all know, the challenge and opportunity always, confused with hope, in the21st century, is also twin human facing challenges period. special performance in this aspect of the relation between man and nature. human deforestation, blind development farming, damaging the vegetation, causes soil erosion, desertification, any natural resources, make the underground mining mineral deposits in the increasingly exhausted, wastewater and waste, exhaust gas emission, make continuous natural environment seriously deteriorating.

　　human nature is excessive to take, suffer the nature ruthleretaliation: hurricane, rainstorm, storms, floods and drought, insect, heat, forest fires, earthquake, etc., the world because of drought disaster equipoised reasons caused the transference refugees until2025reach100m. painful ecological lesson, has attracted the attention of the world and all mankind, ioc commission inspection bid cities, improving the eco-environment is one important content. china has issued a lot of environmental protection policies and regulations. our country also attaches great importance to the protection of environment education, the "building a green campus activities", in the country for grandeur.

　　students, our school is always in advocating "green wanli", which is one of important content protection beautify our campus. we often see many students on campus each picking up litter, with our own hands to protect a beautiful campus. however, we also often see some we don"t want to see their scenario: the playground, stairs, corridor have the pa-pe-r scraps, the profession. again see the lawn, some classmates in trample, the school"s green belts, sometimes found to have deep foot-prints, some places even gone became trail.

　　my fellow students, we is the21st century master, awareneof environmental protection is modern signs. we must have the era of responsibility. responding to global, focus on the side, based on the campus. many curved waist, don"t pick up peel confetti throws anywhere disorderly vomit, more step, don"t crogreen belts, grassland. "kindnesmall and not for, is a sin to steal a pin," starts from me, since the childhood, starts from the side with, starting from now. to protect the earth mother, purify the campus.

　　we only have one world

　　as is known to all , we have a beautiful world .we can see the sun shining. we can see the moon in a full view. we can see the birds flying in the sky. we can see the horses running on the plain. however, the world is not as beautiul as before, for human beings have brought a disaster to the world.共2页，当前第1页1 2

　　so it is high time that we should do something to change this situation. as a citizen, we can do much for it. for example, we could use disposable goods less. and we are supposed to save resources such as water, electricity and so on. also, we ought to plant more trees to reduce the greenhouse effect. in addition, we could try our best to publicize the knowledge of environment protection. because we only have one world。