The world's population reached it 7 billion border. The UNO decided to give speical certificaties to three newborns from St-Petersburg, Kaliningrad and Petropavlovsk Kamchatskiy. At the Same time The Guardian thinks that the 7-billion citizen is a girl, which was born in Phillipinnes. Still, that is just the point - we're 7 billion now. The population of the planet is growing exponentially. This brings us only to thinking of a not-very-bright future or some guesses about what number of people will be in 20 or let's say 50 years. I don't even want to think what problems it brings as it was discussed many times previously.