Gravity is a force that can cause something to overcome inertia ... with a RE this is caused by the Earth's Mass, however, if that does not cause gravity and as the FET believers suggest gravity is a force felt by us as the Earth accelerates upwards, then there must be something that is pushing us. this must be perpetual energy, because it is always in one direction and infinite. If this was true, then there would be no need for any Fuels, we can use this energy to power everything on Earth. Fantastic, the FET has saved us billions !!