Four billion years ago, Earth was a fiery, tumultuous world of molten rock, volcanic eruptions, and toxic skies, with searing heat and the constant threat of asteroid impacts. Thankfully, our planet has cooled off a bit since then. Nevertheless, the Earth still radiates vast amounts of geothermal energy. It’s a clean, limitless, always-on power source lying beneath our feet — we just have to dig for it. Or get robots to do the hard work for us.  Borobotics, a startup from Switzerland, has developed an autonomous drilling machine — dubbed the “world’s most powerful worm” — that promises to make…

This story continues at The Next Web