“…Authors also highlighted that not in all cases the use of biofuels leads to the reduction of CO 2 emission [22]. Critics around the world point at high investment costs, the need to support wind and solar power stations by conventional power plants, ecological and health hazards, and doubtful effect on total CO 2 emission [22][23][24]. Nevertheless, the CBA (cost-benefit analyses) indicate many benefits (environmental, economic and other, non-conventional), which surpass the costs of initial support for renewable energy sources development (being gradually reduced per generated energy unit) if appropriate policy steps are taken [25,26], and further technological improvements, especially technologies of converting the transportation sector and the introduction of flexible energy system technologies are crucial [27].…”