Not surprisingly, the effect lost statistical significance at two years since active intervention lasted only 12 months.

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Mr Kramer traces his passionate, persuasive argument through chapters on the significance of melody, the transcendent effect of song, the particular appeal of the piano and music as a repository of mythic images.

ECONOMIST: Classical music

In this audio section, BBC World Service environment specialist Richard Black explains the so-called greenhouse effect, global warming, the implications for the human race and the significance of the Kyoto summit.

BBC: See and hear how the world could alter

The regression results for Europe, using the same approach as outlined earlier, show a consistently negative effect of social transfers on growth, even though the coefficients vary in size and significance (table A7.4).

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