What would our planet look like with unlimited and cheap (i.e. almost free) energy?

Imagine the population of our planet is given free (almost) and unlimited energy.

What kind of technologies would go mainstream which are not feasible today due to prohibitively high energy requiremnts? What would happen to our environment with 12 billion humans 'high' on unlimited energy? What would our planet end up looking like when obeserved from out space? Would 'everybody' end up owning a space ship?

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What would our planet look like with unlimited and cheap (i.e. almost free) energy?

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