Investment in clean energy has been on a steep upward path for years. Now, oil and gas companies are becoming some of the largest new investors in clean energy projects, reports the Fort-Worth Star Telegram.

Koch Industries, a long-time oil and gas supporter, has invested nearly $1.7 billion in advanced energy technologies. Major oil and gas companies like Exxon and Shell have either partnered with clean energy companies, or directly purchased wind and solar farms.

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