As we know the earth is moving/spinning very fast. This motion means that a huge amount of energy is behind it. Why we can't use it, I guess is because we are moving with it.
But what if we could use the energy of other planets or moving objects in our solar system?
If we could somehow grab the energy of say, Mars or Moon and transfer it here on earth, then no longer do we need to burn fuel. If we make two electrons entagnled and then throw one to the moon, it's movement forced by the moon will give us instant reaction for the other electron here.
This could be pure clean energy for every one!