As the United Nations Sustainable Development Summit
[https://sustainabledevelopment.un.org/post2015/summit] convenes in New York
this weekend to adopt the post-2015 development agenda and the Sustainable
Development Goals
[http://www.un.org/sustainabledevelopment/sustainable-development-goals/], the
contribution of forests and tree-based systems to the “Zero Hunger Challenge
[http://www.