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The International Energy Agency (IEA), not to be confused with the International Atomic Energy Agency (IAEA), acts as an energy policy advisor for the governments of its 28 member countries. It was established in the wake of the oil crisis of 1973-1974 to coordinate international action in times of oil supply emergencies.

While "energy security" remains at the core of the Agency's mission, its mandate now covers energy efficiency, climate protection and international collaboration in the field of energy technology. The IEA also publishes the yearly World Energy Outlook, a report that is often considered as the Bible of the world energy community.

On Friday 9 April, Nobuo Tanaka, Executive Director of the IEA, was the distinguished guest of this month's Inside °ÄÃÅÁùºÏ²Ê¸ßÊÖ seminar¡ªand "revolution" was the subject of his talk.

The revolution Nobuo Tanaka advocates is a peaceful, but nonetheless painful one. It is based on the "450 scenario"¡ªin reference to the objective of bringing greenhouse gases in the atmosphere to 450 parts per million¡ªand calls for drastic action to develop energy-efficient technologies that will mitigate climate change.

"Energy," says Nobuo Tanaka, "is at the heart of the climate change problem, and so must form the core of its solution." This means developing roadmaps for electric vehicles¡ªconventional ones will have disappeared by 2050¡ªwind farms, concentrated solar power, nuclear power, "smart grids," and, of course, fusion.

Based on "assumptions more than projections," the "revolutionary scenario" which Nobuo Tanaka detailed in his presentation has a cost: a huge incremental investment of $10.5 trillion by 2030.

Quite expensive ... but "the consequence of no action," the Executive Director of the IEA concluded, "would be disastrous."