Sustainability Mattersis a compilation of some of the best research papers by students from the National University of Singapore's inter-disciplinary graduate programme in environmental studies, the MSc in Environmental Management [MEM]. This collection is for the period 2009/10 to 2011/12.As the period covers 3 academic years, the papers have been split into two volumes: Sustainability Matters: Asia's Green Challenges, and Sustainability Matters: Asia's Energy Concerns, Green Policies and Environmental Advocacy. These two volumes are the third and fourth compilation by the programme, and respectively comprise sixteen and fourteen of the best research papers completed during this period. The papers have been edited for brevity. These papers analyze the many challenges to effective environmental management in the context of different countries including India, Sri Lanka, Bangladesh, China, Hong Kong, Nepal, Singapore, and Thailand, and propose insightful solutions.The first compilation, Sustainability Matters: Environmental Management in Asia, was published in 2010 (World Scientific) and comprised the best papers from 2001/2 to 2006/7. The second, Sustainability Matters: Challenges and Opportunities in Environmental Management in Asia was published in 2011 (Pearson), and comprised the best papers from 2007/8 to 2008/09.