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I’m referring not just to the sociability it promotes, which Jane Jacobs identified, or to the density it allows, which Rem Koolhaas celebrates, or even to the ecological efficiency it sustains, which now makes New York, on a per-capita basis, a very green place.

After the ceremony, in which chants were chanted and vows, written by the couple’s friends, were exchanged, guests sat down to a series of talks, with PowerPoint presentations, on subjects of interest to the couple — ecological efficiency, neuroscience, holistic healing.

Walkers crisps Photograph: Linda Nylind The consumer war waged between Pepsi and Coke takes a new twist in Britain today with PepsiCo pledging to reduce the and water consumption of its UK operations by an ambitious 50% in five years, in the process leapfrogging Coca Cola's plan to improve its ecological efficiency by a similar amount.