The best way to cut down on oil use is to personally use less electricity and enjoy a lower standard of living.... suing people will mot help... only solution is accepting a lower stanndard of living.
Most of the necessary changes are too big for individual people: we don’t have direct control over heavy polluting companies, a large fraction of our personal energy footprints are things like inefficient transportation and housing designs which are strongly encouraged if not required by public policy, etc. For businesses, there’s a prisoner’s dilemma where nobody wants to take on the cost of rearchitecting ahead of their competitors.
This is especially important with the fossil fuel companies who don’t just sell materials but actively work to prevent alternatives. Companies like Exxon have known about the risks since the 1970s, when their own scientists concluded global warming would happen, and their response was to lobby hard against efforts to use less CO2 and astroturf an entire network of faux-experts whose talking points are all over the news. Just as with the tobacco companies, suing is appropriate and effective.