Physics & Astronomy
carbon isotopes
100%
global warming
95%
permafrost
42%
hydrates
30%
estimates
29%
methane
23%
melting
19%
oxidation
18%
carbon
17%
fractionation
15%
sediments
15%
destabilization
15%
sampling
10%
Earth & Environmental Sciences
carbon isotope
60%
Eocene
55%
global warming
54%
thawing
27%
permafrost
25%
methane
19%
substrate
17%
organic matter
17%
oxidation
16%
carbon
14%
diagenesis
12%
marine sediment
12%
isotopic composition
11%
environmental change
10%
fractionation
10%
sampling
7%
land
7%
sediment
6%
Chemical Compounds
Organic Matter
27%
Hydrate
24%
Methane
20%
Carbon Atom
12%
Oxidation Reaction
11%
Fractionation
11%
Sampling
10%
Amount
5%