温室气体浓度是指大气中温室气体分子数目与干燥空气总分子数目之比，以ppm表示。例如大气中二氧化碳浓度为280ppm，即指在每100万个干燥空气分子中，有280个二氧化碳分子。
随着温室气体浓度的下降，地球开始再次变冷，最终又将回到冰河时代。
Gradually as the concentration of greenhouse gases goes down, Earth starts to cool again, and eventually you slip back into an Ice Age.
这代表着大气的变暖，会比人们根据温室气体浓度水平去推想的速度要慢。
This means that the atmosphere will warm more slowly than a given level of greenhouse gas would lead you to expect.
托尼伊斯特利：澳大利亚科学家警告说，温室气体浓度上升极大改变了我们海洋的功能。
TONY EASTLEY: Australian scientists are warning that rising concentrations of greenhouse gases are dramatically changing the way our oceans function.
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