An aerial photo on the web site of U.S. Sustainable Energy Corp. shows a plant in Natchez, Miss. where the company says it will soon begin producing 1.5 million gallons a day of biodiesel-like fuel from soybeans.

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Rio Tinto Alcan chief executive Jacynth Cote said the smelting plant was no longer a "sustainable business" because of spiralling energy costs.

BBC: Alcan plant at Lynemouth

On Wednesday, after the third meeting of the taskforce, Mr Swinney said options were being explored to deliver a "sustainable employment and economic future" for the plant.

BBC: Workers in a meat factory

With the board's approval, the treatment plant project eventually became the Omega Center for Sustainable Living.

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The sustainable living project is considerably less esoteric: a wastewater treatment plant built with the very latest in green technologies and construction techniques.

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In other news, this week Qatar showcased designs for 9 sustainable stadiums for the 2022 World Cup and BIG unveiled plans for a plant-wrapped waste to power plant that doubles as a ski slope.

ENGADGET: Inhabitat's Week in Green: the power plant you can ski, and NASA's orbiting Nanosail-D