Your set of choices is limited & reflective of a certain narrative. First, many (including Russia) contend that petroleum is not old plant matter, but made fro

Your set of choices is limited & reflective of a certain narrative. First, many (including Russia) contend that petroleum is not old plant matter, but made from a geological process. We also have plenty of Coal & Natural Gas; never mind Solar energy. There's also weather modification (e.g. Stratospheric aerosol injection). There's also other forms of energy. There's also Electrogravitics, which contends that Gravity & Electricity are related. The Electrogravitic model provides a unified model that is simpler than String Theory. If Electrogravitics is an accurate model, then we are living on a massive engine (planet Earth) & can, as Nikola Tesla has demonstrated, harvest the energy generated by this engine.