Nowadays, the most famous trouble is over population while in urban centres majority of people lower than in capital cities and day by day so many people are moving from suburbs to city centres .
Over population, nowadays, is the biggest problem of the world, because it could be dangerous for all people, first reason is recourses, if population is decreasing, that is mean we need more recourses for living. For example, destroy forests, find more oil etc.In the future, we can face with problem, when we wouldn’t have any recourses and many people will die with out them.
On the other hand, we can protect that problem. First thing which we can do, that is limit for amount of children in families, no more than 2 or 3 children in family but who will have more than limit, they will get a big penalty from governments, maybe something worst than fine.Moreover, education has a huge impact on that situation, if people can understand that child is a big responsibility they would not make 5 or more children while people with out any education want to make more and more children because they do not understand responsibility of that, how they will buy things which they want etc.Finally, until they would not understand how that problem influence on the world, that problem will be forever, all governments and education centres need to explain for all people about that problem and after that it wont be a big problem.
In conclusion, it must have been a problem which we cannot protect but day by day that problem will decrease , because now people care how will live their children in the future(finance way).