Hoi An’s local population is roughly 120,000 residents. In contrast, the city’s annual visitor count soared to a staggering 4.3 million just last year. As a result, this Vietnam hotspot is suffocating under the weight of its own waste. So what’s being done about it? Writer Claire Boobbyer travels to Hoi An to meet with some of the city’s most dedicated, and innovative, eco-pioneers.