From 2002-2010, conservative billionaires gave $120 mil to groups casting doubt on climate change
"An investigation by The Guardian this year found that from 2002 to 2010, conservative billionaires had contributed nearly $120 million to around 100 groups who were casting doubt on the science behind climate change."
Source: Kat Grigg, "Crowdsourcing Climate Change Science (with Help from Obama's Tweet)," Solutions (2013): 26.