He claimed that the government needs to do far more if it is to compete on a global level in terms of energy efficiency strategies, reports Reuters.
Speaking at the Energy Institute conference in London, Mr Porritt said: "After 35 years in sustainability I can't remember one government minister talk with deep knowledge and passion about efficiency."
Meanwhile, G8 nations could start sharing energy efficient technology as part of a sustainable buildings network.
Speaking on behalf of the signatory nations, Steven Chu, the US energy secretary, said: "This partnership can help lead the world toward greater energy efficiency. It will facilitate greater cooperation on our shared goals."
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