I gusti putu Diva Awatara STIE AUB Surakarta   Jl. Mr. Sartono No. 97 Surakarta Surakarta, Central Java 57135 Indonesia   gruppe_cemara@yahoo.co.id   www.stie-aub.ac.id           JEL Areas: Q0 : Agricultural and Natural Resource Economics; Environmental and Ecological Economics: General Q5 : Environmental Economics: General