Reference:

 

https://www.google.com/imghp?hl=en&tab=wi (All Images);

 

altenergy.org (Types of Renewable Fuel Sources); 

 

http://alternativeenergy.procon.org/view.timeline.php?timelineID=000015 (Historical Time Line);

 

http://money.howstuffworks.com/5-renewable-energy-careers.htm#page=1 (Renewable Energy Careers);

 

http://www.iisbe.org/about; http://www.eesi.org/about (Initiatives Promoting Sustainability)