| They are not "inclined" to die off, but according some physicist who made a scale of different levels of civilization, and currently we're at the crossroads where most civilizations die. A point where are technological advancements far surpass our social advancement, and we are at the greatest risk of destroying ourselves. As for how many advanced civilizations are out there at any point in time is something that I believe is completely up in the air, there could be none, there could be hundreds, we don't even know the size of the universe, much less how many civilizations are out there.
btw, we are currently at civilization level 0, our main power source are dead plants!!! Not quite as advanced as we like to think of ourselves, in fact it almost sounds pathetic. |