Problems on Earth
The World in 50 years will be facing disastrous wars and nature phenomena and mankind will be trying to solve those problems in every possible way they can. Although a lot of problems like famine in Africa and pollution in Asia are solved, those solutions caused new problems.
The time we are living in now we have power bars with all the essential nutrients.
Biotech companies are trying to find ways to develop this idea even more to make food pills. The western world will develop food pills to save the people in Africa from a horrible death of starvation. Because of this people in Africa won’t be as poor and weak anymore because the pills are free. They can now use this money to develop a bit more and start taking care of their own.
The pollution problem in Asia will be solved as well. This is caused by the fact that the Asian people developed a way to filtrate the polluted air and make it clean again. They also developed a way to get rid of toxic and nuclear waste. This can be done by adding certain ions to make a 
solution where the toxic ions are coupled to other ions. This will form a solid which can be filtrated out of the water. On one hand this is good. On the other hand it will cause another problem. South-America will be jealous of Africa and Asia. This is because South-America wasn’t allowed to have anything until the corruption and criminal problems would be solved. This will not go as easy as expected because the corrupted leaders of South-America will start a Nuclear war. Africa and Asia will form and alliance and bomb South-America. The people living in South-America will overthrow the government to stop the war. The world will be in peace again. However a lot of nuclear weapons were used to end this war, the air is polluted and the earth will warm up a lot more. In this way the polar caps will melt completely and there will be tsunamis all over the world.
Nowadays scientist are trying to find solutions to prevent the global warming from increasing. They are trying to stabilize the emission of greenhouse gasses and eventually to get them down to a point where global warming will stop. Maybe they can develop this more in the future and solve the whole problem. When all problems are solved, the world will be united and work together with every country to try to prevent more problems to happen like those explained above.