Exaggerating the extent of the challenges we face might help someone sell a product, but it provides little confidence in its reliability.
World population growth is a hot-button issue. A large segment of the public seems to believe that humans will continue to reproduce until we run out of food and water. Basically, we're just like cockroaches or bacteria. No serious demographer believes that -- as world fertility has been declining for years -- but facts haven't killed off this pernicious myth.