house gases are the primary drivers of such changes. yet for decades many oil companies like exxon knew the use of fossil fuels could ruin the planet and endanger humanity but chose to put its muscle behind efforts to manufacture doubt about the reality of global warming its own scientists once con firld. now the house is investigating. the house environmental committee sent letters requesting information on their role in spreading disinformation setting a hearing date. congressman ro khanna joins me now. tell me what the idea behind this hearing is? >> chris, you framed it exactly correctly. we want to have big oil hearings like waxman had the big tobacco hearings. in fact, people advising waxman are actually helping us craft the investigation. there are three main objectives.

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