ARDL with bounds test Building Integrated Photovoltaic (BIPV) Dempster Shafer Analytic Hierarchy Process Environmental economics GHG emissions Germany Internet NARDL model RES Renewable Energy Enterprises Renewable energy sources Research & information: general Thessaloniki acceptance actor plurality attitudes auction scheme barriers benchmark citizen attitudes citizens’ energy companies co-existence co-location communication community energy curriculum customer satisfaction decision-making deforestation department of forestry