According to the Velcro cosmos, the very existence of stuff around us is proof that we live in a universe with an abundance of energy. According to that theory, energy is stored as size, primarily as structures made out of inertial matter.
To get hold of "free energy" all we have to do is to reverse the natural tendency of the universe to produce structure.
No energy is free in any economic sense of the word, though. Machines have to be built, stuff has to be done, and time has to be spent in order to get hold of energy. The energy produced is simply freed from being tied up in structure to be transported through motion to some purpose we deem useful to ourselves.
This has been done ever since we first put fire to a log to produce heat for ourselves back in the stone ages. There is nothing new in all of this.
There is also energy freely available in our environment. This too is not new to us. We all know that things heat up in the sun. There is also electric charge in our atmosphere, enough to produce lightning. There is wind and there are waves on the ocean, and there are lakes and rivers that we can tame to produce hydroelectric power.
There is no shortage of energy, and the list of potential sources is long. We have the rotation of our planet, we have radioactive material, we have geothermal energy. The only challenge in all of this is to determine what is the most economic source of energy. What gives us the most energy for the least amount of effort?
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