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POPSBig Oil as Venture Investor Wall Street Journal, in a special section today, includes a look at how giant oil companies have approached venture investment in energy. Exxon Mobil apparently has no interest. Canada's EnCana regards it as "social investment and supporting innovation." Also discussed is Shell's involvement with Virent Energy Systems, a company we looked at here: http://www.forbes.com/beltway/2008/03/11/virent-ethanol-gasoline-biz-cz_atg_0312beltway.html