the　Environmental　Education　(EE)　refers　to　organized　efforts　to　teach　about　how　natural　environments　function　and,　particularly,　how　human　beings　can　manage　their　behavior　and　ecosystems　in　order　to　live　sustainably.　This　article　discusses　the　importance,　content　and　development　of　environmental　education,　Focus　on　the　Contributions　of　Environmental　NGO　to　Informal　EE.　(C)　2012　Published　by　Elsevier　B.V.　Selection　and　peer　review　under　responsibility　of　Information　Engineering　Research　Institute