An energy efficiency scenario (Joint Institute for a Sustainable Energy and Environmental Future) demonstrates that an energy future built on the use of cost-effective, high-efficiency technologies is clearly within the grasp of South Korea and would justify a nuclear power moratorium with significantly lower carbon dioxide emissions. This is a promising result, especially because applications of other sustainable energy options, such as renewables, decentralized technologies, material recycling/reuse, ecologically based land use planning, forest conservation, sustainable agriculture, and redirection of economic development toward an environment-friendly industrial base, are not included in the analysis. Here lies one of the most fundamental policy choices of the newcentury: Will we build a sustainable energy and environmental future, or will we send forward the burdens and risks of a policy regime that is unwilling to value the future beyond the satisfaction of short-term interests and convenience? It is a critical time for South Korean policy making.