The U.N. says the world's population
will reach a milestone this Monday -- 7 billion people. Since 1927, our population has soared from 2 billion to 4 billion in 1974, 무료바둑이게임
and 6 billion in 1999. CBS News correspondent Russ Mitchell talks about the population increase with demographer Joel Cohen of Rockefeller University
>Mitchell: "How fast is the world growing?"