1972年6月5日，联合国召开了“人类环境会议”，提出了“只有一个地球”的口号．会议规定每年的（　　）为世界环境日．

世界环境日为每年的6月5日，是1972年6月5日联合国首次召开人类环境会议，通过了《人类环境宣言》，它的确立反映了世界各国人民对环境问题的认识和态度，表达了人类对美好环境的向往和追求．它是联合国促进全球环...

A、造成温室效应的原因是二氧化碳的大量排放，而目前的二氧化碳排放主要来自于煤炭、石油和天然气的大量燃烧；防治措施尽量减少煤炭、石油和天然气的使用，开发新能源，故A错误；
B、生活中使用含磷洗衣粉或洗涤剂等会造成水体污染，从而产生赤潮，使用该法不能防治赤潮，故B错误；
C、工厂排出的废烟、废气，人们生活中排出的废烟、废气，交通工具排出的废气，造成空气中主要污染物有二氧化硫、氮氧化物，形成酸雨，所以工厂废气不能直接排放，故C错误；
D、防治沙尘暴的措施：禁止乱砍乱伐，植树造林，加大绿化面积，故D正确．
故选D．

Environmental protection of the first milepost -- Stockholm Conference
In June 5,1972," the United Nations Conference on the human environment " held in Stockholm.A total of 113 countries and some international organizations have more than 1300 delegates attended the meeting.The delegate that attends the meeting,extensive research and summarize the related protection of the human environment theory and real problem,formulate countermeasure and measure,put forward " only one earth " slogan,and calls upon Governments and people for the maintenance and improvement of the human environment,the benefit of all the people,the benefit of future generations together.This is the first study in Chinese history of protecting human environment conference,is the international community on environmental issues held the first World Conference,marks the human on the environment problems of awakening,is the environmental protection of the world history the first milepost.