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Eighteen House Democrats have signed a letter to the top executives of the major oil companies asking them what they knew and when about climate change.

The letter, a copy of which was obtained by the Washington Examiner, will be sent in the wake of a Los Angeles Times and Inside Climate News report that officials at ExxonMobil, then just Exxon, hid studies from their scientists showing the burning of fossil fuels affected climate change.

Read more on WashingtonExaminer.com