We're still using fossil fuels because it's cheaper to employ them as a power source and for transportation than the alternatives. When fossil fuels actually begin to run out, the cost of using them will go up, when that cost exceeds the alternatives we will switch over.
You think that is not going to be a problem? Things getting ridiculously expensive? If we don't come up with something else soon, there will be no affordable alternative available.
And switch over? To what? Every alternative "fuel" right now (electricity, hydrogen) has to be produced
with fossil fuels and that's no solution.
Dr. Doom and Gloom, Out.