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