This issue has been burgeoning for decades,  but no one seems to want to really deal with it, but it became the nightmare of nightmares in a film called Soylent Green, with Charlton Heston?  In the meantime, it's only our more intelligent sector who have been limiting their birthrate.  That does not augur well for humanity's future. If humans were any other species but our own we would be considering radical culling to manage the population, and limit the damage it is doing to our environment. The connection is self-evident.  Every tree cut down to feed or house a human being is a home lost to multiple species. The most recent oil spill in the Gulf of Mexico has to wake Americans, and all oil-dependent populations, up.  Just what do they imagine oil companies are seeking oil in such insecure, vulnerable regions for?