Whatroledidthejungleplayinhumanity'sdistantpast,andwhatcanittellusaboutourfuture?Thefinalepisodelooksforcluesamongtheprimatesoftherainforestsaswellasthetracesofancientcivilizationsthatthrivedthere,onlytovanish.Forexample,using3-Dinfraredsatelliteimagery,thescientistspiecetogetherwhatmighthavehappenedtothelostcivilizationofAngkorWat,Cambodia,tracinghowthecity'srelentlessexpansionledtochangesinclimateandecologyandeventuallytodrought,starvation,warfare,andabandonment.