Let's turn to someone with (possibly) more credibility than Roger Ebert. Michael Hayden, the director of the CIA, thinks number one issue facing us on this tim

Let's turn to someone with (possibly) more credibility than Roger Ebert. Michael Hayden, the director of the CIA, thinks number one issue facing us on this time scale is population growth: https://www.cia.gov/news-information/speeches-testimony/landon-lecture-series.html https://www.cia.gov/news-information/speeches-testimony/land... "Today what I’d like to do is spend a little time with you not on the close fight, but on the deep fight, and to look at three global trends that point to a 21st century that will undoubtedly be quite different from the century just ended. ... In thinking about the future, one of the most important things that our analysts brought to ... my attention was world demographics. ... Today, there are 6.7 billion people sharing the planet. By mid-century—by mid-century, the best estimates point to a world population of more than 9 billion. That’s a 40 to 45 percent increase—striking enough—but most of that growth is almost certain to occur in countries least able to sustain it, and that will create a situation that will likely fuel instability and extremism—not just in those areas, but beyond them as well." He goes on to talk about demographics in different regions of the world and how this will affect Americans. I kind of buy it.