Why we have to start living more like the Na'vi now

[Human No More]

It's perfectly possible if we can build a Dyson shell (a series of satellites to pick it up directly from the sun (either in orbit arond the sun or in High Earth orbit) and beam it to Earth), but trying to use it from the Earth's surface is completely nonviable and is THE most expensive form of energy available, as well as creating complete environmental destruction in areas where resources are processed for it (although many pro-solar people's reaction there is essentially "but that's a poor country, so we don't care").