List of Articles Economic Aspects Open Access Article Abstract Page Full-Text 1 - Solid wastes separation considering environmental economic aspects: technical vs. traditional system (case study: Tehran district 20) Hassan Karimzadegan Seyed Masoud Monavari Reza Naghavi Afsaneh Hassani Open Access Article Abstract Page Full-Text 2 - Economic, social, and environmental aspects of using biofuels Mohammad Safari Gholamhossein Safari Open Access Article Abstract Page Full-Text 3 - Comparative study of rural individuals and dehyaran attitudes in relation to dehrari’s activities in Hadi project Mohammad Kavoosi Kalashami Tayebbe Hatamnia Mohammad Karim Motamed