Write a composition in no less than 150 words on the topic: How can we contribute to the environmental protection. You should write according to the outline given below. Write your composition on the Answer Sheet. 1．环境保护已成为我们共同的责任； 2．你认为我们该怎样做才能降低能耗，节省资源，保护地球环境？ 3．请举例说明。