Fifty year from now! Is something very difficult to predict.
Probably humans are going to have to adapt to many changes in order to protect the specie and the environment.
I think, It is going to be easier to travel around the space as people travel today to Europe and other continents. 50 years from now some scientists are going to discover other kind of energies to travel. These are going to be more efficient and cheaper. They are not going to pollute the environment.
Maybe we are going to know other ways of living very far away from here. Governments and politicians will be making very important decisions to preserve their own countries lives. People will be living and working producing what they need for surviving. Humanity will be facing the most important challege. After signing peace treatments, politicians are going to look for new ways of producing water and raising forest. Medicine field will be very advanced while humans are going to suffer new sickness.
As the world is going to experiment wars, at the end, people will be getting the peace. Finally, it will be the way humans could survive.