WhentheAudetfamilytu的精選

問題詳情：WhentheAudetfamilyturnsonthelightsatBlueFarm,theyareusingelectricitythatcomesfromcows—cowmanure(糞肥),tobespecific.Cowsproducealotofwastes.Onecowcancreate30gallonsofwasteseachday.Nowimagineth...