AE: alternative energy, renewable resources, can be made again, peanut oil, avocado oil, sunflower oil, coconut oil, trees, sun, solar, hydroelectric energy, water, biofuel, wind energy, FF: fossil fuels, nonrenewable resources, can NOT be made again in a reasonable time, oil, gas, coal, natural gas, crude oil (made deep underground), petroleum, gasoline, contains decayed organisms buried deep under heat & compaction,

AE & FF

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恢復自動保存: ?