I read Lester Brown's book, Plan B 3.0 about two years ago (as I mentioned in Backstory Part III). It's a difficult book to get through because you have to plow through a lot of doom and gloom (about two thirds of the book) before getting to any sign of hope. Brown does offer solutions to the problems, but the book is a lot of explaining exactly the what, where, why, and how of all of these global issues.
While I wholly recommend the new book, I found this video series on You Tube that is a pretty good primer. It was recorded at the University of Chicago on November 17, 2009. This is the sort of thing that should be viral and yet part one only has 112 views, part five has less than 50 views.
If you haven't read the book or are not familiar with Lester Brown's work, I encourage you to take the time to look at this series: