【題目】讀材料,完成下列小題。
材料:氣象觀測表明,近百年來,全球平均氣溫上升0.4- -0.8C。氣溫上升,會(huì)使極地地區(qū)的冰雪融化,引起海平面不斷上升,沿海低地地區(qū)可能被淹沒。氣候?yàn)槭裁磿?huì)變暖?科學(xué)家認(rèn)為,既有自然原因,也有人為原因。二氧化碳對大氣有保溫作用。人類一方面燃燒煤、石油等,大量產(chǎn)生二氧化碳;另一方面,砍伐森林減少森林對二氧化碳的吸收,結(jié)果使得大氣中二氧化碳的含量增加,氣溫也就隨著升高。
(1)根據(jù)材料,簡述導(dǎo)致全球氣候變暖的人為原因。
(2)簡述全球氣候變暖的危害。
(3)簡述減緩全球氣候變暖的可行措施。
【答案】(1)①人類燃燒煤、石油等大量產(chǎn)生二氧化碳,二氧化碳對大氣有保溫作用;②人類砍伐減少森林對二氧化碳的吸收,使得大氣中二氧化碳含量增加,氣溫也就隨著升高。
(2)氣候變暖會(huì)使極地地區(qū)的冰雪融化,引起海平面不斷上升,沿海低地地區(qū)可能被淹沒。
(3)措施:不過度使用煤、石油等,不過度砍伐森林,多植樹造林,出門盡量不乘坐自己買的車,多騎自行車或步行。
【解析】
根據(jù)近50年來,人類在生產(chǎn)、生活過程中,大量燃燒煤、石油等排放的二氧化碳等溫室氣體急劇增加,使全球氣溫升高,旱澇等災(zāi)害頻繁,進(jìn)行分析解答。
(1)近年來,全球氣溫升高,導(dǎo)致極端天氣頻發(fā)。導(dǎo)致全球氣候變暖的人為原因是:人類燃燒煤、石油等大量產(chǎn)生二氧化碳,二氧化碳對大氣有保溫作用;人類砍伐減少森林對二氧化碳的吸收,使得大氣中二氧化碳含量增加,氣溫也就隨著升高。
(2)全球氣候變暖的危害是:氣候變暖會(huì)使極地地區(qū)的冰雪融化,引起海平面不斷上升,沿海低地地區(qū)可能被淹沒。
(3)減緩全球氣候變暖的可行措施有:不過度使用煤、石油等,不過度砍伐森林,多植樹造林,出門盡量不乘坐自己買的車,多騎自行車或步行。
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