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Coal companies have also been developing other businesses to generate more revenue and achieve sustainable development.
Codoon, for example, tracks running times and distances, while Keep offers workout routines.
Comparing the emissions from producing gray ammonia to those from burning coal is complicated, experts say, but they agree that it won't be considered environmentally friendly unless produced renewably.
Confident of the future
Compared with the boom in online business, China's largest secondhand car market, the Huaxiang market in southern Beijing, which has a cluster of more than 600 shops, is seeing fewer shoppers.
