【题目】读材料，完成下列小题。
材料:气象观测表明，近百年来，全球平均气温上升0.4- -0.8C。气温上升，会使极地地区的冰雪融化，引起海平面不断上升，沿海低地地区可能被淹没。气候为什么会变暖?科学家认为，既有自然原因，也有人为原因。二氧化碳对大气有保温作用。人类一方面燃烧煤、石油等，大量产生二氧化碳；另一方面，砍伐森林减少森林对二氧化碳的吸收，结果使得大气中二氧化碳的含量增加，气温也就随着升高。
（1）根据材料，简述导致全球气候变暖的人为原因。
（2）简述全球气候变暖的危害。
（3）简述减缓全球气候变暖的可行措施。
【答案】（1）①人类燃烧煤、石油等大量产生二氧化碳，二氧化碳对大气有保温作用；②人类砍伐减少森林对二氧化碳的吸收，使得大气中二氧化碳含量增加，气温也就随着升高。
（2）气候变暖会使极地地区的冰雪融化，引起海平面不断上升，沿海低地地区可能被淹没。
（3）措施：不过度使用煤、石油等，不过度砍伐森林，多植树造林，出门尽量不乘坐自己买的车，多骑自行车或步行。
【解析】
根据近50年来，人类在生产、生活过程中，大量燃烧煤、石油等排放的二氧化碳等温室气体急剧增加，使全球气温升高，旱涝等灾害频繁，进行分析解答。
（1）近年来，全球气温升高，导致极端天气频发。导致全球气候变暖的人为原因是：人类燃烧煤、石油等大量产生二氧化碳，二氧化碳对大气有保温作用；人类砍伐减少森林对二氧化碳的吸收，使得大气中二氧化碳含量增加，气温也就随着升高。
（2）全球气候变暖的危害是：气候变暖会使极地地区的冰雪融化，引起海平面不断上升，沿海低地地区可能被淹没。
（3）减缓全球气候变暖的可行措施有：不过度使用煤、石油等，不过度砍伐森林，多植树造林，出门尽量不乘坐自己买的车，多骑自行车或步行。
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