The Amazonian town putting world cities to shame

Puerto Nariño is a tranquil experiment in sustainable living where motor vehicles are banned and the streets are as clean as Copenhagen's.

The boat dock in the Colombian town of Leticia was a hive of market-traders, tuk-tuks and bobbing water taxis. I bought a ticket from a small office on the Malecón promenade and navigated my way past a cluster of wooden houses on stilts to a row of floating platforms beside the Amazon River. There were no proper steps down to the water. Instead, I clambered down a slippery bank and showed my ticket to a busy attendant handing out life jackets.

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