In the context of global warming, SU and precipitation showed an increasing trend: the change slopes were 0.178 and 18.007, respectively, whereas FD showed a decreasing trend in China from 2009 to 2017: its change slope was −0.589.
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Does Natural Amenity Matter on the Permanent Settlement Intention? Evidence from Elderly Migrants in Urban China.
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PM2.5 also showed a decreasing trend on the whole, especially after 2014, mainly because China promulgated the “Air Pollution Prevention and Control Action Plan” in 2013, when government departments and enterprises took various actions to prevent and control regional pollution.