Well, this report from the Daily Telegraph made me laugh:

Recycling could be adding to global warming rather than reducing it, a key [UK] government adviser on waste management has said. Peter Jones suggested that an “urgent” review of Labour’s policy on recycling was needed to make sure the collection, transportation and processing of recyclable material was not causing a net increase in greenhouse gases. Mr Jones, a former director of the waste firm Biffa and now an adviser to environment ministers and the London Mayor, Boris Johnson, also dismissed kerbside recycling collections in many areas as “stupid” because they mixed together different materials, rendering them useless for recycling. He suggested that much of the country’s waste should simply be burnt to generate electricity.