There is currently more oil in reachable deposits in the western hemisphere than in all of Saudi Arabia. Enough oil for the next 100 years at current growth rates. Plenty of time to worry about alternatives. Necessity is the mother of invention. When it becomes necessary to develop a new fuel source, we will find an answer. Besides as we explore both space and our planet we might find something new that we never knew of before.
TGElder NCC 1701-E