结果，每年大约有400亿吨的二氧化碳被排放到大气中，化石燃料的消费成为人类最大的无意的地球工程的实验。
As a result, about 40 billion tons of carbon dioxide are sent into the atmosphere every year, making fossil fuel consumption the biggest of all humankind's unwitting geoengineering experiments.
其它一些团队正在尝试利用电厂烟道中排放的二氧化碳生产液体燃料，还有一些团队正在实验利用生长在阳光中的藻类生产燃料。
Other groups are exploring the use of CO2 from power station flues to create liquid fuels, while a related research effort is testing how algae grown in sunlight can be used to create fuels.
一些航空公司也正对一些可能降低排放的新方法进行实验，例如使用藻类燃料而非原油。
Some airlines are experimenting with innovations that may someday reduce emissions, like using fuels made with algae rather than crude oil.
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