Continued integration of pro-poor environmental sustainability issues into development processes is at the core of the work of the joint United Nations Development Programme United Nations Environment Programme Poverty-Environment Initiative (UNDP-UNEP PEI). PEI is an exemplar of how to articulate social, economic and environmental sustainability in development policies and plans at the country level. The year 2011 has been a critical one in accomplishing the transition from making the case for the integration of poverty-environment objectives into key development issues and actually making this integration happen. This report highlights many of the successes and some of the challenges PEI has faced during 2011.