When David Cameron straddled his mountain bike and decreed that Conservative central office would from now on be "carbon neutral", it was a canny piece of political positioning. Climate change and the need to reduce our fuel use - or go carbon neutral, to use the fashionable term - has risen to unprecedented prominence in the public consciousness, and it's not only Cameron who has chosen to tap into this. Chancellor Gordon Brown made the environment a central political battleground in last week's Budget when he raised the climate change levy, a tax on the most polluting companies.
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