The definition of urban is relating to a city or of a city with a population of at least 50,000 people. An example of urban is the nature of Manhattan. urban. of or characteristic of the styles and culture of the inner city, esp. of the black inner city: urban music, fashions, etc. urban.
Renewable energy is generally defined as energy that comes from resources which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat.enewable energy resources exist over wide geographical areas, in contrast to other energy sources, which are concentrated in a limited number of countries.
Renewable energy allows you to tap into natural resources that are replenished as part of the normal life cycle. Cut a tree down to burn for heat, and that tree is gone forever. Tap into the wind with a turbine to generate electricity, and the wind continues to blow. The Union of Concerned Scientists suggests the following clean renewable energy sources: Wind Power. The U.S. can produce more than 10 times its energy needs through wind power, one of the fastest-growing energy sources. Turbines use wind to generate electricity without creating pollutants. Currently, this is one of the least expensive alternative fuel sources available.