The United Nations Environmental Program published a report this year that explains investment trends in renewable energy.
As outlined in the graph, $257 billion dollars was invested in renewable energy in 2011, a growth of 17% from 2010. In just 7 years, from 2004 to 2011, investment in renewable power and fuel has seen a growth of 559%!
The report also explains the distribution of renewable energy investment by region. The chart below shows how much money (in Billions!) each region invested in renewable power and fuel from 2010-2011.