WhentheAudetfamilyturnsonthelightsatBlueFarm,theyareusi...
问题详情：WhentheAudetfamilyturnsonthelightsatBlueFarm,theyareusingelectricitythatcomesfromcows—cowmanure(粪肥),tobespecific.Cowsproducealotofwastes.Onecowcancreate30gallonsofwasteseachday.Nowimagineth...