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Cities are part of the system we’ve invented to keep people alive on Earth. People tend to like cities, and have been congregating in them ever since the invention of agriculture, 10,000 or so years ago. That’s why we call it civilisation. This origin story underlines how agriculture made cities possible, by providing enough food to feed a settled crowd on a regular basis. Cities can’t work without farms, nor without watersheds that provide their water. So as central as cities are to modern civilisation, they are only one aspect of a system. There are nearly eight billion humans alive on the planet now, and that’s a big number: more than twice as many as were alive 50 years ago. It’s an accidental experiment with enormous stakes, as it isn’t clear that the Earth’s biosphere can supply that many people’s needs – or absorb that many wastes and poisons – on a renewable and sustainable basis over the long haul. We’ll only find out by trying it.

All of Elon Musk’s companies have one thing in common, using existing technologies n some new way to solve a problem no one thought to solve. He is not about pushing science forward but about using technology in new ways. “Warp Drive” was a concept invented by the authors of the 1960s Star Trek TV series to move the plot forward. It is fiction. The mark of a good science fiction writer is that he can make his made-up fake science seem like it might be real, at least until the end of the show. It seems these authors were too good, and they have fooled a generation of fans into thinking that the show actually predicts the future. But be assured that all the technology of that show was secondary to the story. It worked as it did because it was best for storytelling If you think about how a real-world “warp” might work, then perhaps you don’t need a spaceship because the wrapped space can be inside an office building on Earth and you go to some other planet by walking down the hallway and opening the door to the planet “Zookoo-9”. But the authors wanted a show that had spaceships with a bridge crew. So they made up warp drive as a kind of spaceship engine. Other Sci-fi shows have actually made it to be inside a building on Earth. It is fiction, so you can make it as you like. But still, the Star Trek version is so good that people on Quora ask if the technology will ever be real. No. The idea was made up out of thin air for an old TV show.