Gravity is one of the main factors that make us stable. The load dead and living , always on earth surface can be collected on a sensor based battery where this recharging generates other useful energies. Then fuel consumptions would drop, the oil, gas and nuclear reactor would fall from top to maybe 4th rank. Everyone got weight and gravity, so with respect to level of energy production and consumption it would be almost equal, if theoretically all energy summation is constant, that means one form gets transformed to another but “energy” remains same.
People who are fat will not feel totally neglected, after all they got weight 😉 that produces energy..
Whenever, we want to fly, we use this energy to build a thrust that repels us proportionate to our weight, and gives us option to elevate and fly..no fuel..only weight…wait for this idea to get into market 😉