Now here is a reason to be scared; today is the Day of Seven Billion. That is, today is approximately the day when the world's human population will reach 7 billion people. In my lifetime, the world population has grown more than 2 billion people. That's pretty scary. Fortunately, some work is being done on this. The United Nations Population Fund is working to build awareness about the challenges associated with this level of human population. Hopefully awareness-building will produce results.
(The pressure such a large human population puts on the environment is the issue discussed on Andrew Revkin's Dot Earth blog. If this interests/concerns you, I highly recommend adding Dot Earth to your news routine.)