Give or take a few thousand there are now 7 billion people on this tiny planet. When I was born I was the 2,687,150,676th person alive on Earth and I was the 76,006,063,340th person to have lived since history began. Deliberately mixing my metaphors, the rate of world population growth has speeded up like a truck without brakes, careering downhill. What about you? Check out your vital statistics with the help of the BBC. Click here.