The Earth is getting hotter, the ice is melting, the oceans are rising, and they’re filling up with plastic. We’re losing species, building up greenhouse gases, and running out of time. It’s easy to feel downhearted. And yet there are so many reasons to be cheerful: the watchword is ‘sustainable’ and it’s being applied to every area of human activity — energy, food, clothing, travel, cities — you name it. But even if everything was 100 percent sustainable there’d still be work to do to repair the damage we’ve done. Where to start?
