http://thinkprogress.org/climate/2015/10/20/3714390/bernie-sanders-investigate-exxon-climate-denial/
"ExxonMobil conducted research as far back as 1977 affirming that climate change is caused by carbon emissions from fossil fuels. At the same time, the oil giant gave millions of dollars to politicians and organizations that promote climate science denial, and spent millions more lobbying to prevent regulations to limit carbon emissions.
Sanders, like many, compared the allegations against ExxonMobil to the DOJ’s massive and successful lawsuit against the tobacco industry. That action found that a number of big tobacco companies engaged in racketeering by conspiring to hide the harmful impacts of smoking from the public."
