Body: Scholars who research "Renewable energy sources" look at Sources of energy that can be replaced.
Some motivations are Look for alternative sources of energy other than the non-renewable oil reserves.
Several topics in "Renewable energy sources" include Biomass, Hydropower, Geothermal, Wind, Soar.
A few notable experts of "Renewable energy sources" include Toby Couture, Alexander Ochs, Steven Chu.