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Forty-five House Democrats signed a letter to the CEOs of six oil companies demanding what they knew about climate change and when.

The letter, dated Monday, was sent to the leaders of ExxonMobil, Chevron, ConocoPhillips, BP, Shell and Peabody Energy, according to a copy of obtained by the Washington Examiner. It asks when each company became aware of the effect fossil fuels have on global warming, what that company did with the information and if each company funded groups that deny climate change.

Most climate scientists blame the greenhouse gases emitted from the burning of fossil fuels for warming the Earth.

Read more on WashingtonExaminer.com