sources of energy like geothermal tidal power hydrogen nuclear fusion and so forth will require a more visionary approach and even greater scientific and technological advancement these advances in turn will require substantial investment which at present is not forthcoming from public and private sources on a large enough scale only by ensuring a reliable affordable supply of energy will it be possible to chart a stable course for economic recovery and growth addressing energy insecurity and transforming the global energy system must therefore constitute a major priority for any longterm programme of economic and climate stabilization in advanced countries such a course will simultaneously address the climate challenge