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A Financial Times investigation has uncovered widespread failings in the new markets for greenhouse gases, suggesting some organisations are paying for emissions reductions that do not take place.
Others are meanwhile making big profits from carbon trading for very small expenditure and in some cases for clean-ups that they would have made anyway.
The growing political salience of environmental politics has sparked a ?green gold rush?, which has seen a dramatic expansion in the number of businesses offering both companies and individuals the chance to go ?carbon neutral?, offsetting their own energy use by buying carbon credits that cancel out their contribution to global warming.