Jonathon Porritt, one of Britain's leading environmentalists, has attacked the Treasury for being "startlingly arrogant" and for dragging its feet over sustainability.
This month Porritt steps down as chairman of the Sustainable Development Commission, an independent government watchdog, after occupying the role since it was founded nine years ago.
He said: "Looking back now, as I am in my last few days, I see a terrain of wasted opportunity. I am not saying the only reason is the intransigence of the Treasury, but I do think the Treasury has killed a lot of the energy around sustainable development."
Porritt, who is being replaced by William Day, gave the Treasury credit for hiking the landfill tax and for commissioning Sir Nicholas Stern's review on the economics of climate change. However, he added: "Too often they have been foot-dragging and obstructive."
He said: "It is a startlingly arrogant part of government. There is almost no curiosity about sustainable wealth creation. There is no readiness to interrogate the macro-economic model. SDC produced a repo