Exxon is worth $293 billion right now. Its earnings over the past N decades are probably worth more. For that money, you could buy alternative energy providers outright. You could buy Siemens (~$50 billion), who, in addition to transportation and other lines of businesses, have a big renewables business, and are among the world leaders in nuclear ... or, well, they were, until 2011, when they abandoned that line of business entirely.

There is no financial case to be made here whatsoever.