The cases of Paris, Freiburg, Copenhagen and Helsinki

        The cases of Paris, Freiburg, Copenhagen and Helsinki all rely on various green strategies to address key urban challenges. Drawing upon these cases, develop a strategy that might be applicable to cities elsewhere (let's say the US) and how it might be implemented given the differences in the respective planning and governance systems.    
One key implementation strategy for this type of policy would involve utilizing existing local legislation to provide incentives for businesses who choose to participate in these green initiatives. For example, municipalities could offer tax credits or other financial assistance packages in exchange for implementing more sustainable practices within their businesses that benefit the environment - such as installing solar panels on rooftops or establishing a carpooling program among employees - which ultimately encourages more firms to adopt such strategies over time making it easier for city government\'s overall vision come fruition with minimal effort & cost. Another important factor is education since people need guidance when it comes understanding how best they can help contribute towards creating a healthier planet so hosting regular town hall meetings or workshops along with publishing relevant information through various media outlets like newspapers & magazines will go long way towards highlighting potential benefits training citizens alongside stakeholders alike about what steps need taken next order make sure all goals are met accordingly because without knowing & appreciating why certain changes must occur nothing really gets done properly period!

Sample Solution

The primary green strategy that could be applied to cities in the US is sustainable urban development. This approach aims to increase the efficiency of natural resources while reducing environmental impact by promoting low-carbon activities, energy conservation, and efficient transport systems. By investing in more environmentally friendly initiatives such as walkable neighborhoods, public bike-share programs, mass transit systems, green infrastructure (i.e., parks and community gardens), water conservation projects, and renewable energy sources such as solar panels and wind turbines; cities can become significantly greener without having to drastically alter their current planning or governance systems.