The problem is that fossile fuel companies (and other polluting industries) don't just answer an existing demand but also influence on that demand: they lobby a

The problem is that fossile fuel companies (and other polluting industries) don't just answer an existing demand but also influence on that demand: they lobby against environmental regulation, run influence campaigns against climate science, use greenwashing, etc. Those companies and their shareholders can't be taken out of the equation as they're not neutral.