Author Lester Brown explains climate change's impact on food
security  As shifting weather patterns and weather-related
disasters become more prevalent, food insecurity is a growing
concern. During today's OnPoint, Lester Brown, president of the
Earth Policy Institute and author of the updated book, "Plan B
4.0: Mobilizing to Save Civilization," explains why he believes
food security is "the weak link" for our civilization. Brown
also discusses recent worldwide progress on renewables,
including solar, wind and geothermal energy.   Monica Trauzzi:
Welcome to the show. I'm Monica Trauzzi. Joining me today is
Lester Brown, president of the Earth Policy Institute and author
of the updated book "Plan B 4.0." Lester, nice to have you on
the show.  Lester Brown: Monica, I'm pleased to be here.  Monica
Trauzzi: You've just released an updated version of your widely
known "Plan B" book, some new trends that you're focusing on;
food insecurity and the global push for renewables. Why are
these themes so important as we