Abstract ETE 21 (Energy, Technology and the Environment — a Circle to Promote Rational Action for the 21st Century) proposes technological solutions to meeting the growing needs for energy in an ecologically responsible and economically viable manner. When such technological solutions face barriers to their acceptance policy instruments may need to be considered — as a last resort. This paper considers the policy options available after briefly discussing the environmental objectives and technological solutions. Environmental Objectives need to be defined, before policy issues are addressed. In the field of human needs air rates highest, followed by water, food, shelter, comfort, power and mobility. The last three in this league table are particularly dependent on energy in modern society. Meeting he needs for energy creates repercussions higher in the league table either directly through atmospheric or water pollution or indirectly through possible climate change. ETE 21 believes that rational action would require tackling the pollutants and their direct adverse impacts. In most cases this will help relieve the indirect (and still ill-determined) effects of so-called Green House Gases. Technological solutions provide the most logical and promising option to ameliorate the impact of the use of the energy in an ecologically responsible and economically viable way. Most new technologies will enter the system through the commercial pricing mechanism. In certain cases e.g. where heavy front-end (capital) loading is involved some “greening of the invisible hand” might expedite technological penetration. Established accounting systems do not take the negative externalities (pollutants, CO 2 ) into account, nor social costs (health, congestion, time loss). Mechanisms are being devised to quantify such environmental costs. As such they may (via “trial and error”) help to steer public policy . Policy Options can in the first instance be confined to education, persuasion and exhortation. If these do not achieve the environmental objectives within the timescale desired, forms of intervention (dirigism) will need to be introduced. These range from Market to Mandatory Instruments, which in turn can be sub-categorised. This will be discussed in the presentation. A Resilient Strategy can be achieved by testing alternative strategies against a spectrum of environmental objectives.