Can green walls help tackle pollution health risks?Air pollution, the world's biggest environmental health risk, requires a fresh approach

摘要

One of the world's most prolific killers, air pollu-Ition causes more than seven-million deaths U globally every year, according to the World Health Organization. That amounts to one-in-eight of total global deaths, is more than double previous estimates and confirms air pollution is now the world's largest single environmental health risk."Reducing air pollution could save millions of lives," says Denes Honus, who hopes to chip away at that figure in Glasgow. Last month his Berlin-based company installed two large green walls. Each "CityTree" is 4m tall, 3m wide and 2m deep, and is said to have the environmental benefit of up to 275 urban trees. Glasgow is the first UK city to take CityTrees, each one costing about E20,000.