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Editorial
Nature 441, 384 (25 May 2006) | doi:10.1038/441384a; Published online 24 May 2006
Carbon omissions
When the European Union (EU) started the world's first mandatory greenhouse-gas emissions trading system in January 2005, there was widespread scepticism about its prospects. Thousands of companies were allocated 'allowances' for emitting a given amount of carbon dioxide; if they produce more, they have to buy extra credits.
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