Topic
Alaska
178
Siberia
132
Northwest
103
Pacific -- History -- 20th century
92
Arctic
61
John Muir
57
naturalist
56
climate change
51
Nome
42
Permafrost
41
Climate change
40
[SDE]Environmental Sciences
38
Fairbanks
36
history
36
Arctic transport
34
Arctic accessibility
33
Ecology
33
History
33
permafrost
33
Ecology, Evolution, Behavior and Systematics
31
Ice roads
30
Land surface models
30
Winter roads
30
California
28
Seattle
27
Arctic soil
26
GHG production
26
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology
26
greenhouse gas emissions
26
silicon
26
soil respiration
26
travel
26
writing
24
690
23
Geology
23
Aviation
22
Canada
22
Event label
22
Verlagsveröffentlichung
22
article
22
tundra
22
United States
21
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology
21
Environmentalist
20
General Earth and Planetary Sciences
20
Russia
20
[SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory
20
conservation
20
correspondence
20
letters
20
more ...