There are several ongoing investigations of fossil fuel companies to determine their role in the climate crisis. States, municipalities and even a group of children are suing these companies for damages caused. Details on some of these cases are here. Younger generations are fighting for a livable planet. There is evidence that these companies knew of the dangers associated with greenhouse gas emissions, planned around the expected impacts (such as sea level rise), and actively worked to discredit the scientific consensus that climate change is caused by GHG emissions.
The Illinois Attorney General has expressed support for climate action and filed friends of the court briefs in some of the other cases. If you believe AG Raoul should investigate these companies, please take action by calling his office directly. Information to help you with the call is here.