| Without it, scientists estimate that the average temperature on Earth would be colder by approximately 30 degrees Celsius, far too cold to sustain our current ecosystem. Second, we need to clarify the way humans contribute to the greenhouse effect. While the greenhouse effect is an essential environmental prerequisite for life on Earth, there really can be too much of a good thing. The problems begin when human activities distort and accelerate the natural process by creating more greenhouse gases in the atmosphere than are necessary to warm the planet to an ideal temperature, for example, burning natural gas, coal and oil, including gasoline for automobile engines, raises the level of carbon dioxide in the atmosphere. Some farming practices and land-use changes increase the levels of methane and nitrous oxide. Many factories produce long-lasting industrial gases that do not occur naturally, yet contribute significantly to the enhanced greenhouse effect and global warming that is currently under way. | |
| 按科学家估计,如果没有温室效应，地球上的平均气温会降低大约30摄氏度,温度过低无法维持我们目前的生态系统。第二,我们需要弄清楚人类是如何造成温室效应。尽管温室效应是地球上的生命的一个重要的环境前提,但是太多却会造成伤害。当人类活动在大气中制造更多的温室气体，从而扭曲和加速自然过程，地球变暖的理想的温度,例如,燃烧天然气,煤和石油——包括汽油汽车发动机——增加了大气中二氧化碳的浓度,此时问题便开始产生了。一些农业实践和土地利用变化增加了甲烷和一氧化二氮的浓度;许多工厂排放非正常产生的工业气体,很难散去,然而，目前这些气体明显加强了温室效应和促进全球变暖。 |
| Without it, scientists estimate that the average temperature on Earth would be colder by approximately 30 degrees Celsius, far too cold to sustain our current ecosystem. Second, we need to clarify the way humans contribute to the greenhouse effect. While the greenhouse effect is an essential environmental prerequisite for life on Earth, there really can be too much of a good thing. The problems begin when human activities distort and accelerate the natural process by creating more greenhouse gases in the atmosphere than are necessary to warm the planet to an ideal temperature, for example, burning natural gas, coal and oil, including gasoline for automobile engines, raises the level of carbon dioxide in the atmosphere. Some farming practices and landuse changes increase the levels of methane and nitrous oxide. Many factories produce longlasting industrial gases that do not occur naturally, yet contribute significantly to the enhanced greenhouse effect and global warming that is currently under way. | |
| an ke xue jia gu ji, ru guo mei you wen shi xiao ying, di qiu shang de ping jun qi wen hui jiang di da yue 30 she shi du, wen du guo di wu fa wei chi wo men mu qian de sheng tai xi tong. di er, wo men xu yao nong qing chu ren lei shi ru he zao cheng wen shi xiao ying. jin guan wen shi xiao ying shi di qiu shang de sheng ming de yi ge zhong yao de huan jing qian ti, dan shi tai duo que hui zao cheng shang hai. dang ren lei huo dong zai da qi zhong zhi zao geng duo de wen shi qi ti, cong er niu qu he jia su zi ran guo cheng, di qiu bian nuan de li xiang de wen du, li ru, ran shao tian ran qi, mei he shi you bao kuo qi you qi che fa dong ji zeng jia le da qi zhong er yang hua tan de nong du, ci shi wen ti bian kai shi chan sheng le. yi xie nong ye shi jian he tu di li yong bian hua zeng jia le jia wan he yi yang hua er dan de nong du xu duo gong chang pai fang fei zheng chang chan sheng de gong ye qi ti, hen nan san qu, ran er, mu qian zhei xie qi ti ming xian jia qiang le wen shi xiao ying he cu jin quan qiu bian nuan. |
| Without it, scientists estimate that the average temperature on Earth would be colder by approximately 30 degrees Celsius, far too cold to sustain our current ecosystem. Second, we need to clarify the way humans contribute to the greenhouse effect. While the greenhouse effect is an essential environmental prerequisite for life on Earth, there really can be too much of a good thing. The problems begin when human activities distort and accelerate the natural process by creating more greenhouse gases in the atmosphere than are necessary to warm the planet to an ideal temperature, for example, burning natural gas, coal and oil, including gasoline for automobile engines, raises the level of carbon dioxide in the atmosphere. Some farming practices and landuse changes increase the levels of methane and nitrous oxide. Many factories produce longlasting industrial gases that do not occur naturally, yet contribute significantly to the enhanced greenhouse effect and global warming that is currently under way. | |
| àn kē xué jiā gū jì, rú guǒ méi yǒu wēn shì xiào yìng, dì qiú shàng de píng jūn qì wēn huì jiàng dī dà yuē 30 shè shì dù, wēn dù guò dī wú fǎ wéi chí wǒ men mù qián de shēng tài xì tǒng. dì èr, wǒ men xū yào nòng qīng chǔ rén lèi shì rú hé zào chéng wēn shì xiào yìng. jǐn guǎn wēn shì xiào yìng shì dì qiú shàng de shēng mìng de yí gè zhòng yào de huán jìng qián tí, dàn shì tài duō què huì zào chéng shāng hài. dāng rén lèi huó dòng zài dà qì zhōng zhì zào gèng duō de wēn shì qì tǐ, cóng ér niǔ qū hé jiā sù zì rán guò chéng, dì qiú biàn nuǎn de lǐ xiǎng de wēn dù, lì rú, rán shāo tiān rán qì, méi hé shí yóu bāo kuò qì yóu qì chē fā dòng jī zēng jiā le dà qì zhōng èr yǎng huà tàn de nóng dù, cǐ shí wèn tí biàn kāi shǐ chǎn shēng le. yī xiē nóng yè shí jiàn hé tǔ dì lì yòng biàn huà zēng jiā le jiǎ wán hé yī yǎng huà èr dàn de nóng dù xǔ duō gōng chǎng pái fàng fēi zhèng cháng chǎn shēng de gōng yè qì tǐ, hěn nán sàn qù, rán ér, mù qián zhèi xiē qì tǐ míng xiǎn jiā qiáng le wēn shì xiào yìng hé cù jìn quán qiú biàn nuǎn. |
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