User blog comment:Glflegolas/Human Extinction -- are we approaching the Doomsday?/@comment-50.36.81.25-20150309211911

Earth will be destroyed. Scientists know this, it is literally inevitable. As the Sun "dies", it will slowly, VERY slowly, expand into a red giant, going out possibly to the orbit of Mars. This is like 6 million years into the future, so humanity will hopefully not be reliant on Earth by then. If humanity is going to be wiped out, well, it's not going to be by any sort of "global warming". Look up global average temperatures before the Little Ice Age. It would most likely be because of something impossible to prevent-a gamma ray burst is a true cosmic nightmare, because, due to the fact that it travels at the speed of light, is nearly impossible to gain any sort of forewarning of, and, by the time it reaches our solar system, is the almost as large as the solar system itself. Also, it would cook every planet in the solar system to cinders. Probably not an asteroid impact, assuming that astronomy continues to advance quickly and we develop a comprehensive early-warning system. We already have the means and method to stop asteroids, it's simply a matter of finding dangerous lumps of space rock and using a "gravity tractor" or even something fun, like a laser. Of course, the laser is further into the future, but a gravity tractor can happen as soon as a spacecraft reaches an asteroid. If a nuclear war starts, say in the Middle East or in India/Pakistan, then the world is in deep trouble. Because a nuclear winter is entirely possible. Same with Yellowstone or another super volcano, the true effect is covering the entire Earth in a Second Darkness-like cloud layer, reflecting huge amounts of sunlight, cooling the Earth into a sort of Ice Age...that kills off plants, then animals, and then humans. But hopefully we can avoid dooming our own planet through nuclear weapons. But the other logical ends are...difficult to prevent.