I think the current level is probably adequate, where I feel more money and energy should be invested is into changing the situations that are contributing to the depletion of the existing fuels.
I recently read that if the manufacturing of plastic bottles were stopped the amount of petroleum that would be saved could extend the life of current supplies dramatically. LIquids used to come in glass and had a refund so were recycled, now it comes in plastic that ends up in the oceans and land fills. Similar case with plastic bags, disposable diapers, and on.
One of the ironies of life here is that plastic bags are banned, you must bring your own cloth bag or purchase a paper bag when you go to the grocery store. However there is a movement afoot to replace glass in bars with plastic cups so the patrons don’t take each other’s eyes out in drunken brawls with broken glass. Go figure???