http://www.realclearscience.com/topic/topic.php?id=25389Ecosystem ServicesTopic http://www.newscientist.com/article/mg21628882.000-costing-the-earth-the-value-of-pricing-the-planet.html?full=true Fred Pearce, NewScientist 100249815 Entries Thu, 01 Nov 2012 00:00:00 -0400 159355 http://blogs.plos.org/blog/2011/04/20/ecosystem-services-critics-and-defenders-debate/ Jamie Hansen, PLoS 100240799 Entries Thu, 21 Apr 2011 00:00:00 -0400 79628