What is our next fuel source?

Realistically speaking, what's the world's plan after oil reserves are exhausted? When exactly are we going to stop drawing energy from dead plants and carbon rocks? Synthesis? Nuclear energy? Solar? Hydrogen? I'm interested in engineering science, so no need to spare details. I've read... show more Realistically speaking, what's the world's plan after oil reserves are exhausted? When exactly are we going to stop drawing energy from dead plants and carbon rocks?

Synthesis? Nuclear energy? Solar? Hydrogen?

I'm interested in engineering science, so no need to spare details. I've read articles and watched tv shows on the subject.
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