According to [0], private sector investment in clean energy in the US alone was over $100 billion in the US.  In 2012.<p>[0] <a href="http:&#x2F;&#x2F;www.acore.org&#x2F;files&#x2F;pdfs&#x2F;ACORE_Outlook_for_RE_2014.pdf" rel="nofollow">http:&#x2F;&#x2F;www.acore.org&#x2F;files&#x2F;pdfs&#x2F;ACORE_Outlook_for_RE_2014.pd...</a>