Plot twist: We do have a giant fusion reactor in the sky, and it's called the Sun. The cosmic irony here is delicious - fossil fuel defenders will drill holes to the center of the Earth while ignoring the 27 million degree nuclear furnace beaming 173,000 terawatts of power at us daily. That's enough energy hitting Earth every hour to power human civilization for a year, but sure, let's keep burning dinosaur juice because solar panels aren't "reliable enough." The universe literally gave us the answer key to the energy exam, and we're still failing spectacularly.