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Since the start of industrial revolution, humans have burned through enough fossil fuels - coal, oil, and natural gas - to add some 365 billion tonnes of carbon to the atmosphere. Deforestation has contributed to another 180 billion tonnes. Each year, we throw up another nine billion tonnes or so, an amount that has been increasing by as much as 6% annually. If current trends continue, such an increase in carbon dioxide concentrations will produce an eventful average global temperature rise of between 2 and 4 Degree Celsius, which will trigger a variety of world-altering events, including the disappearance of glaciers, the inundation of low-lying islands and coastal cities, and the melting of Arctic ice cap.
自从工业革命开始起，人类已经燃烧了足够多的化石燃料——煤、油和天然气——来为大气添加了大约3650亿吨的碳。森林的破坏又贡献了1800亿吨。每一年，我们大约排出90亿吨碳，这个数量以每年达6%的速度增加。如果现在的趋势继续，这样的二氧化碳浓度增长将会造成全球平均温度升高达2-4摄氏度，这将会触发各种改变世界的事件，包括冰川的消失、低海拔的岛屿和沿海城市的淹没，以及北极冰盖的融化。
全球变暖是人们都关心的话题之一，在备考托福考试时，要紧跟社会热点，多练习。更多托福作文信息可以关注