Californiahaslosthalfitsbigtreessincethe1930s,according...
問題詳情：Californiahaslosthalfitsbigtreessincethe1930s,accordingtoastudytobepublishedTuesdayandclimatechangeseemstobeamajorfactor（因素）.Thenumberoftreeslargerthantwofeetacrosshasdeclinedby50percentonmore...