AUTHOR=Nair Ramachandran P. TITLE=Grand challenges in agroecology and land use systems JOURNAL=Frontiers in Environmental Science VOLUME=2 YEAR=2014 URL=https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2014.00001 DOI=10.3389/fenvs.2014.00001 ISSN=2296-665X