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Global Warming
全球变暖
Global warming is the increase in the average temperature of the Earth's surface air and oceans.
全球变暖指的是地球大气和海洋平均温度的上升。
Climate change is any major change in measures of climate,such as temperature, rainfall and wind.
气候变化是衡量如温度、降雨量和风力等的重大改变。
Scientists have debated about global warming for years.
科学家一直在全球变暖这个话题上争论不休。
Many have different opinions about the extent to which greenhouse gases are responsible for it.
许多人认为工厂，发电厂或机动车辆大量排放的温室气体（例如二氧化碳）是造成全球变暖的主要原因。
Greenhouse gases, such as carbon dioxide,are produced by factories, power stations and vehicles.
如二氧化碳等的温室气体是由工厂、发电站及车辆排放所导致。
They trap heat in the Earth's atmosphere.
这些气体能阻止大气层散热。
Research shows the level of carbon dioxide gas in the Earth's atmosphere has increased by more than 30% in the last 250 years.
研究表明，在过去250年，大气层二氧化碳浓度的增加超过了30%。
Carbon dioxide is produced by burning oil and coal.
二氧化碳是石油及煤燃烧生成的。
An increase in global temperatures has led to other problems.
全球变暖引发了其他问题:
Scientists have observed a rise in sea levels and a melting of ice in the Earth's Polar areas.
科学家已经观察到在地球的两极地区海平面的上升及冰川的融化。
Scientists also believe that global warming is affecting endangered plants and animals,sea life and the seasonal activities of organisms.
极地冰川消融导致海平面上升，影响到濒危动植物，海洋生物以及生物的季节性活动。
