通过燃烧煤、石油和天然气，人们增加了大气中的“温室”气体，例如二氧化碳。
Through burning coal, oil and gas, people have been increasing the greenhouse gases in the atmosphere, such as CO2.
气象气球主要是用来测定温度，气压和风速的，另外它还能够测出空气中很多种气体的含量，例如二氧化碳和氧气等。
This weather balloon will mostly measure temperature, air pressure, and wind speed, but others sample the air for the concentration of various gases like carbon dioxide and oxygen.
从前许多科学家认为只有那些较轻的能够引起温室效应的气体，例如二氧化碳，才能够围绕地球游动，但是现在看来带有悬浮颗粒的烟雾也是可以的。
While many scientists once thought that only lighter greenhouse gases, such as carbon dioxide, could travel across the Earth, they now say that aerosol clouds can too.
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