Eco-architect Bill Dunster has devoted his career to proving that giving up fossil fuels can enhance, rather than diminish, our lifestyles. Yet while heating homes generates huge volumes of CO2, and is our major contribution to global warming, Britain's construction industry still largely ignores him. Are Bill's lo-tech, revolutionary ideas a sign of hope we can meet the biggest challenge of the 21st century, or proof we're incapable of acting until it's too late?

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