In at least one renewable field – solar-thermal water-heating - China already has made significant progress, according to Andy Goldstein, China-based market development manager for Apricus Solar. "China accounts for 70% of the world's solar-thermal market," he noted, adding that "90% of the hot water produced at Beijing Olympic sites will be with solar-thermal."

Back to the term itself. "Clean up one's act" is an American idiom. It's one of many awkward sounding (awkward to the Chinese ear at any rate) idioms involving the word "act", such as "class act", "tough act to follow", "act the hero", "act your age", "put on an act", "get your act together", etc, etc.

Oh, definitions. If one needs to clean up one's act, it means you need to reform, to mend your ways and perhaps to drop some bad habits. In terms of Beijing's smoggy air today, cleaning up our act means, well, we need to have another wind blowing. We need a gale in fact – and we need it now.

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