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Nature 446, 237 (15 March 2007) | doi:10.1038/446237a; Published online 14 March 2007

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Q&A:Klaus Töpfer

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Germany's former environment minister analyses Europe's plan for cutting emissions.

Among those paying close attention to the European Union (EU) summit meeting on greenhouse-gas emissions in Brussels last week was Klaus Töpfer. As German minister for the environment and reactor safety from 1987 to 1994 and under-secretary-general of the United Nations and director of the UN Environment Programme in 1998–2006, Töpfer has been keeping an eye on international climate and energy diplomacy for two decades.