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The world is getting too over crowded, there are just so many of us that the Earth's natural resources cannot sustain us! The strain we're puttin of the Earth's resources is ENORMOUS! Let's lend a hand to our planet and help it in this hour of need!

For your information:
These numbers are estimates depending on the current (and changing) global birth and death rates; not everyone agrees to these numbers. To find out a little more about the world population the best place to start is, of course, Wikipedia's article on the World Population.