Gravitation under human control?

I'm taking this with a grain of salt. It's popular for fringe scientists to assert that gravity can be controlled via electromagnetism. I've seen a couple UFO schematics online over the years that use electromagnetism to play with gravity and produce thrust.

Also, my understanding of gravity is that it really isn't a force at all, but rather a warping of spacetime by an object with mass, which makes the concepts of a field a bit strange to me...

As exciting as this possibility is, I'm more interested in what I'll learn from the refutal which I'm hoping someone who understands this stuff will write here soon.