This could make a good discussion:
Depending on whom you ask, so-called "free energy devices" are either a total hoax or a systematically suppressed technology that's being kept away from the public. There's a lot of interesting ground to cover on this subject of "over unity devices," but that's not the point of this article. Instead, let's look at an unintended side effect of free energy devices that even the free energy proponents don't usually realize exists.
Read more: Real global warming could be unleashed by a hidden technology most people don't even know exists -