What Is Global Warming?
1. The sun's energy heats up the earth's surface, affecting its weather.
2. The earth radiates some energy back into space to moderate the planet's temperature.
3. But as industry booms1 on earth, greenhouse gases, like carbon dioxide and methane2, are released into the air—and trap more and more of the sun's energy in, so the earth's temperature rises.
何为全球变暖？
1. 太阳能使地球表面升温，从而影响地球的气候。
2. 地球将一部分能量反射回太空以缓和气温。
3. 但是由于地球上工业的迅速发展，诸如二氧化碳和甲烷之类的温室气体被释放到空气中——从而又把越来越多的太阳能聚集回地球，地球温度因此而升高。