有几种假说，包括地球变暖或变冷，季节波动或洋流的变化，以及大陆位置的变化。
There are several hypotheses, including warming or cooling of Earth, changes in seasonal fluctuations or ocean currents, and changing positions of the continents.
现在，许多科学家把早期造成地球变暖的大部分原因归结于厌氧微生物——产甲烷菌——它产生了温室气体甲烷。
Many scientists now attribute much of the warming of early Earth to oxygen-intolerant microbes—methanogens—that produce the greenhouse gas methane.
世界各国希望扩大现代能源的使用范围，让大约10亿无法获得现代能源的人用上它们，同时减少导致地球变暖的燃料，而如今的电池突破就是在这时出现的。
Today's battery breakthroughs come as the world looks to expand modern energy access to the billion or so people without it, while also cutting back on fuels that warm the planet.
应用推荐