What are the world’s biggest sources of renewable energy and where are they located?: “Efforts to tackle climate change include heavy investment in renewable sources of electricity around the world. Solar power saw the biggest leap in 2010, with the installed base jumping 70% compared with 2009 to 40 gigawatts. Wind power also grew strongly, adding 24% of generating capacity. Yet the biggest source of renewable electricity, hydropower, and the smallest, geothermal, both only added 3% to capacity. Finding usable sources of either is becoming increasingly hard or costly. The region that saw the biggest growth in renewable energy projects was power-hungry Asia. Investment in renewables also saw the biggest leap since 2007, with $243 billion spent, a 30% increase over 2009.”