[中文]但我们为什么要担心温度看似很小的增长呢？事实证明，全球平均气温在长期相当稳定，在这温度的细微变化是由于环境的巨变。例如，在上个冰川时期，一英里厚的冰层覆盖北美一直到如今的美国北部各州，然而那时的世界只有比如今冷5至8℃（9 to 15℉）。许多现代人类文明都要归功于自上一个冰川时期以来长期稳定的全球平均气温，它使人类文化从农业狩猎采集型社会转型为更长期稳定的农业社会的生态和文化。即使在上世纪气温只有一到两度的变化都可以造成我们环境以及生活方式的巨大改变。
[外文]But why should we worry about a seemingly small increase in temperature? It turns out that the global average temperature is quite stable over long periods of time, and small changes in that temperature correspond to enormous changes in the environment. For example, during the last ice age, when ice sheets a mile thick covered North America all the way down to the northern states, the world was only 9 to 15 degrees Fahrenheit colder than today. Much of modern human civilization owes its existence to the stability in the average global temperature since the end of the last ice age—a stability that allowed human cultures to transition from roaming, hunter-gatherer societies into more permanent, agriculture-supported communities. Even the temperature change of a degree or two that has occurred over the last century is capable of producing significant changes in our environment and way of life.
In the future, it is very likely that rising temperatures will lead to more frequent heat waves, and virtually certain that the seas will rise, which could leave low-lying nations awash in seawater. At the same time, rising global temperatures also change precipitation and other local climate conditions. Changing regional climate could alter forests, crop yields, and water supplies. It could also affect human health, animals, and many types of ecosystems and deserts may expand into existing rangelands. Unless we act now, our children will inherit a hotter world, dirtier air and water, more severe floods and droughts, and more wildfires.
But solutions are in sight. We know where most heat-trapping gases come from: power plants and vehicles. And now we know how to curb their emissions: modern technologies and stronger laws. By shifting the perception of global warming from abstract threat to pressing reality, and promoting online activism. By pressing businesses to use less energy and build more efficient products, and by fighting for laws that will speed these advances.[/外文]