Earth & Environmental Sciences
hydraulic fracturing
81%
viability
78%
methane
63%
wastewater
55%
coal
55%
cost
43%
gas
42%
hydrocarbon
36%
shale gas
32%
coal seam
30%
fluid
18%
crust
15%
salinity
14%
well
13%
coal production
13%
freshwater environment
13%
material
12%
noble gas
12%
coal gasification
12%
groundwater
12%
environmental risk
10%
coal mine
9%
water
9%
landfill
9%
stable isotope
8%
comparison
8%
sludge
7%
isotope
7%
mantle
7%
melt
7%
contamination
6%
in situ
6%
resource
5%
monitoring
5%
Engineering & Materials Science
Hydraulic fracturing
100%
Wastewater
89%
Radioactive materials
43%
Hydrocarbons
37%
Costs
31%
Shale gas
26%
Waste disposal
24%
Fluids
20%
Water
17%
Chemical analysis
13%
Land fill
12%
Uncertainty
6%
Chemical Compounds
Wastewater
66%
Methane
66%
Gas
55%
Coal
50%
Hydrocarbon
37%
Salinity
24%
Groundwater
22%
Thermogenic
18%
Coal Gas
16%
Coal Gasification
15%
Stable Isotope
11%
Noble Gas Atom
11%
Isotope
9%
Environment
5%