On November 24th, Professor Tae-Yong Jung from Yonsei University visited to give a special lecture on "Sustainable Development & Environmental Policy" as a 30th International Development Policy Seminar. The main purpose of this seminar was to discuss about sustainable long-term environmental policies from diverse perspectives. He strongly delivered the message that in order for all of us to improve our economic conditions in a long-term, it is absolutely necessary to carefully consider the importance of protecting environment. In other words, it is our responsibilities to further take in charge to establish sustainable environmental policy. Nonetheless, he also emphasized that mere protective measure is not appropriate rather we need more active measure to address environmental issues.