But what if I own shares of a soda company? What exactly should I do in that case? Try to convince them to exit their primary market and become an entirely different company? Why would I waste my time and energy that way?
It makes absolutely no sense to invest in one kind of company and then insist they become something else. Find another company that is conceptually similar to what you had in mind and invest your time and money in them instead.
Get energy companies to invest in not-coal and not-natural gas, sure, but investing in a petroleum or coal company so you can vote? What exactly do you think you are going to vote for? Suicide?