Creating alternative energy sources based on renewable natural resources (like wind or solar power) is one way of making a community

The correct answer is sustainable. 

A sustainable community basically refers to a community that is designed and built in a specific way that leads to sustainable living. A sustainable community would use renewable and natural resources (solar power, wind power, etc.) that do not damage the environment and eliminate the risk of scarcity of resources. A sustainable community is healthier for the environment and living organisms. 

Ghana, first of the great medieval trading empires of western africa (fl. 7th–13th century). it was situated between the sahara and the headwaters of the sénégal and niger rivers, in an area that now comprises southeastern mauritania and part of mali.