“This time last week, Nathaniel Corum was on a Navajo reservation in Arizona where three elders’ families were moving into new solar-powered homes that he’d designed to be built from straw bales. Next came the news that the Plastiki, a boat made from 12,500 recycled plastic bottles for which he’d designed the cabin, had docked safely in Sydney after a 130-day voyage across the Pacific to protest against plastic waste.”