cqvip:Beijing, once a byword for air pollution, f irst set out in earnest to improve its environment in 1998, when municipal authorities introduced a series of mea-sures to phase out coal as a primary fuel for everything from cooking to heat-ing. In the process, they also relocated a number of highly polluting factories to the city’s periphery, and replaced many of the obsolete, diesel-belching trucks,
展开▼
