I'm doubtful that we can survive for much longer without a huge shift in perception. We're so bent on "progress" (for our species alone) that we are slowly destroying everything else in the pursuit of this "progress"-- eating up natural resources, polluting the air and water, cutting down trees, driving other species to extinction, etc etc etc. We forge continuously ahead, and nothing we achieve is ever good enough; we want more, and we are willing to sacrifice anything, sometimes even ourselves, to KEEP forging ahead toward some goal that lies infinitely ahead of us. And we'll never reach it, because as soon as we reach one goal, we will strive towards something even BETTER than it.
If we destory this planet before we have the ability to leave it and populate other worlds, we will die with it. If we manage to escape this planet, it may take us much longer to do the same thing to other worlds, but eventually, if we do not go through a shift in perception, we will destroy ourselves.
I don't think progress or civilization or even agriculture are necessarily bad. I think a clear goal of WHAT we want to progress toward, combined with an honest desire to "live and let live" (meaning not just us, but other creatures as well--part of the problem with agriculture is that it means that we have decided that land that once fed hundreds of creatures is now only allowed to feed humans... and if other creatures compete with us for "our" food, they must be eliminated) will keep this planet healthy for much longer and will allow humanity to survive.