for example they may obstruct fish migration and affect populations for example carbon dioxide co emissions in austria measured in kilograms per usd of gross domestic product gdp purchasing power parity ppp adjusted were kg per ppp usd of gdp in in albania bosnia and herzegovina the former yugoslav republic of macedonia montenegro and serbia the respective c emissions were and kg per ppp usd of gdp world bank nd there is considerable scope to increase both the security of supply and the sustainability of the energy sector by diversifying fuel sources however installed capacity of these technologies is practically nonexistent at present see table renewables are promoted through a range of policy initiatives including rules for grid connection of renewable generation obligations for the purchase of renewable power specified in secondary legislation such as grid codes and rule books and subsidies to generation from renewables