The organisers of Climate Camp, a protest group that has previously demonstrated at coal power stations and Heathrow airport, have chosen London's financial centre as the target of their main summer protest this year.

The decision to target the City is aimed at throwing a spotlight on the carbon trading system, one of the central planks of the EU's attempts to reduce carbon dioxide emissions from businesses. Carbon trading in the US is also being pushed by the Obama administration, but the activists say they want to highlight the failure of the mechanism to reduce greenhouse gas emissions.

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