Carl Renan Estrellan did his internship under the Global Change and Sustainability Programme at the United Nations University Institute of Sustainability and Peace (UNU-ISP) from August to October 2009. He is presently working on his post-graduate degree at the Department of International Development Engineering at the Tokyo Institute of Technology. His research interests include advanced oxidation processes for water treatment application, management and treatment of persistent organic pollutants (POPs), and climate change mitigation through carbon footprint reduction.