We will adapt. Like we have in the past. The question that should be asked, is much longer till the human race as a whole, discover our faults and follies, and ready ourselves for the next step in evolution? We've already seen the beginning of this next journey, but when will the majority come to realize just as the rest of us have.
The problem that needs to be looked at, is what will bring the climax of our civilization. The next 100 years might be just that. But it all comes back to adaption of the next phase. Will we destroy ourselves? Will we learn to combine as a whole? What is next?
To directly answer your question, we need to come together as one race, one community. One planet, combined as a whole to survive. Racial discrimination between fellow human beings needs to be completely abolished in order for us to become one. What bothers me most, is the fact that for this to happen, we would need to seek outside help, in which we have no proof, nor understanding of help outside of our planet. Is there another way? Maybe.
How. I hate to say that I've only so far answered your question with more questions. But in a way that's all there is that we can do for the time being. We must wait for the next phase, the next inevitable step to present itself in order to discover a solution.
Many points need to be looked at. WMD's. What needs to be done is we need to come together as a planet and share the technologies, rather than put these technologies against one another. Political stances. Whether left wing or right wing, we need to find a middle point. somewhere where we can all agree. Religion needs to be pulled out of all politics for this to happen. I'm not saying that Religion needs to abolished, I just believe that people must learn that religion won't save you.
I'm personally of no religion, however I was brought up a Roman Catholic. The teachings of this religion, I am very familiar of, and was once a follower. But we don't need followers in this new world. "Mankind got it all wrong by taking a good idea, and building a belief structure on it." "Its better to have ideas... you can change an idea, changing a belief is trickier."
There are so many open doors in a question like that. So many doors that need to be closed to continue down that hallway. Your question brings many answers, yet none that will be complete. I wish I were able to help more, but being only a 19 year old Canadian, its hard to help with such a small voice.