所有过期的食物最后被送到了垃圾填埋场，无氧分解以生产出甲烷。甲烷的保温性能要比二氧化碳强20倍。
All the wasted food ends up in landfills, decomposing without air and producing methane, which is 20 times more potent than carbon dioxide in trapping heat.
同时双酚a在低氧或者无氧的环境里都能分解。
BPA also breaks down in the environment where oxygen levels are either low or non-existent.
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