Humans are like cockroaches. We've infected every corner of the globe, and we're not going away. However, if we are to survive and prosper for the next century and hopefully longer, there's going to be some big changes. My boyfriend and I were talking, and following the depletion of oil resources (and not before), we'll see a massive centralization of cities, mostly on coasts, and a move towards renewable energy sources. Cars will never go away; they have too much momentum (no pun intended). But when this happens, we'll see much more of a community feel, as everyone will be in much closer quarters. The massive towers in Dubai and Kuala Lampur (sp?) are good examples of this, and will propogate into the next century as we won't have the finances to get around. Cities like Los Angeles will become a thing of the past, as it will no longer be feasible to have your suburban house with a white picket fence. With this, we'll see a lot of changes. Society will be permanently altered. But as Gloria Gaynor said, "we will survive". If we want to extend ourselves to Mars and the moons of the gas giants, we'll need to perfect the biodome, to be able to live independently. Interstellar travel is out of the question, and always will be. We should give up on it and focus on going to Mars, Europa, and some of the other moons. -sigh-