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Investing one percent of gross world output in clean energy each year could be deemed reasonable and sufficient for meeting the IPCC targets (too weak according to Prof. John Sterman at MIT Sloan -- effect of negative feedback mechanisms are now projected to be weaker than previously thought), though such investment should be geared towards addressing the underlying problem of fossil fuel dependence.

Putting the cost of going green in context

Editor's note: The following column was coauthored by Benjamin Urquhart, a research associate at Harvard University's Center for the Environment, and Mark Winkler, a PhD student at Harvard's School of Engineering and Applied Sciences.

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