“…Coordinated efforts, policies, and instruments benefit from enhanced synergism. In fact, GHG emission reduction requires changes in legislation, financial outlays, organization, and technical changes [ 79 ], which should not be taken in isolation but in a nexus with national and international laws because of the carbon leakage effect. However, generally, the results show that implementing GHG emissions reduction policies, such as technology and research, incentives, and economic adjustments, in countries such as Germany, France, Denmark, and the Czech Republic contribute to reducing GHG emissions.…”