The Earth has an Immense amount of Rotational Kinetic Energy. The published value of that energy is 2.137 * 1029 Joules or watt-seconds. 
If we might put some effort into trying to capture some of that immense amount of available kinetic energy, we already have an awesome source of more energy than we could ever need for a million years, and absolutely no pollution would ever exist! Hundreds of Soviet scientists began to try to capture some of this energy around 1970 in extremely secret research. I did not then know what the Soviets were trying to do, but around 1990, I tried an entirely different method to try to recover some of it. Have you ever watched the giant pendulum in a museum? It is fascinating to watch as the rotation of the Earth under the non-rotating pendulum shows our planet’s motion. (As a small kid, I sometimes spent half a day watching the pendulum in the Chicago Museum of Science and Industry.)
It appears that the Soviets never captured more than about 0.0004 watt of such power, in around 200 complex experiments. During the 1990s and 2000s, the best I ever did in my 5 prototypes was to capture about ten times better, where I extracted about 0.006 watt. Both of our very different methods relied on the Vector nature of the rotational kinetic energy of the Earth spinning, along with using the sets of three Euler Differential Equations.
All of the Soviet (and later, Ukranian) experiments were based on the gyroscopic spinning of the Earth once every day. So all of their experiments required massive gear trains to speed that up by a factor of about a million to one, so they could get a final wheel turning at about 700 rpm, to be able to drive an alternator to produce a tiny amount of electricity. Unfortunately, their impressive experiments had so much friction in all their gears that they wasted most of the energy they had extracted.
I used a very different approach, where I focused on the Precessional motion of any gyroscope, including the Earth. I believe that my approach might have some serious potential, based on some very complex Fourth-Rank Riemannian Tensor Calculus Vector math. Nothing in any of my five prototype devices (2002, 2004) ever moved faster than walking speed, so I did not need all those impressive gears to get a gearing of a million to one of the Soviets. I also never had much friction between my 27 slow-moving internal components. I also discovered an unusual man named Orfyrreus of about 300 years ago that brought several of his “wheels” to county fairs, who realized much of what I had found. He lived in what is now Germany, and at those county fairs, his wheels each constantly rotated at about 28 times per minute, even the last, 12-foot diameter wheel. These peculiar wheels each (somehow) apparently created significant amounts of energy! Even Isaac Newton had a fascination with Orfyrreus’ wheels. Newton never traveled to see any of the wheels but a number of Newton’s scientific friends did. In fact, that last, 12-foot diameter wheel was put into a sealed room, and those scientists each put their wax seals on the door to confirm that it would not be opened for a complete month. When the scientists came back a month later, the giant wheel was still spinning 28 times every minute!
Around 2006, I had to travel to the New York Public Library to read the only book in America that discussed his devices. It was the only time when I was not allowed to touch a valuable book, where a woman in gloves turned the pages for me!
I believed (and believe now) that I just needed to adjust the dimensions of my prototype’s 27 component parts to maximize the performance.
After a few years of trying, I concluded that my brain is not capable of sufficient Riemannian Fourth-Rank Tensor Calculus to simultaneously solve 27 very complex equations to enhance the milli-watt performance of my 2004 tabletop devices up to the continuous 10 kilowatts of (24/7) energy extraction that I believe my approach could produce for each and every family.
You can easily see the precessional vector basis for my approach. Have you ever played with a child’s gyroscope? On its pedestal? When you first release it, it does not have any precessional motion, but a couple seconds later it is actively precessing around its pedestal. Scientifically, this is hard to explain. Sure, the source of the kinetic energy of the precessional motion Conserves Energy, as the weight of the body of the gyroscope DROPS a small fraction of a millimeter in the Earth’s gravitational field (which is a fun experiment to do!) But the angular momentum starts out exactly at zero, and in a couple seconds, the body of the gyroscope is revolving around its pedestal. Orfyrreus may not have understood the Physics of that, but both he and I (and the Museum pendulums) rely on this situation.
I still have hope that some really excellent mathematician can solve really advanced Tensor Riemannian Calculus math to provide this wonderful (clean) energy answer for humanity.