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Northeast China
8
climate change
8
methane emissions
6
surface frost number
6
Environmental effects of industries and plants
5
Environmental sciences
5
GE1-350
5
Renewable energy sources
5
TD194-195
5
TJ807-830
5
normalized difference vegetation index
5
permafrost
4
permafrost temperature
4
wildfire
4
China
3
Heilongjiang province
3
Hydraulic engineering
3
TC1-978
3
TD201-500
3
Water supply for domestic and industrial purposes
3
Xiao Xing’an Mountains
3
correlation analysis
3
envir
3
geo
3
permafrost degradation
3
remote sensing
3
static electricity
3
MODIS LST
2
Q
2
Science
2
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