[hannob]

This comes down to the question whether you should do change "from within".

There are probably cases where there's a reasonable case to do such a thing, e.g. if you have an electricity company that has a somewhat balanced mixture of fossil and renewable energy.

However I don't think this is a sensible approach if we talk about pure or almost pure fossil companies. There's no way Chevron can be "part of the solution". It's either these companies disappear or the planet will become uninhabitable, there's no middle ground on that. The idea that they can reform themselve has been a lie the oil industry has been peddling for a while. More than a decade ago BP said that now stands for "Beyond Petroleum". We can see how well that went.