Re: Time to get started!
You need oil to go to space. You can do it using light and water. More resource intensive, sure...but the idea that there will never be a group of humans so fanatical about the idea of leaving the rest behind and setting out to spread their seed/ideology/religion/whatever is ridiculous. You clearly don't understand what human passion, insanity, fervor or curiosity are capable of.
One good crusade and you'll get humans on other planets, even if just to escape the peckerheads that live here. Besides, Elon Musk will probably prove you wrong inside your own lifetime. Every time someone tells him it can't be done, the bugger goes ahead and does it anyways.