Earth & Environmental Sciences
energy crop
100%
bioenergy
83%
food production
79%
food
51%
fossil fuel
51%
land
41%
subsidy
40%
biofuel
39%
price
30%
fossil fuel consumption
27%
crop
26%
hunger
25%
demand
24%
services
23%
OECD
22%
food availability
22%
civilization
21%
commodity
19%
carbon emission
18%
energy
18%
accessibility
17%
new technology
17%
crude oil
17%
substitution
16%
economic development
16%
society
14%
agriculture
13%
carbon
10%
Agriculture & Biology
fossil fuels
87%
energy crops
84%
food production
74%
land use
72%
bioenergy
62%
subsidies
44%
urban economics
36%
biofuels
35%
carbon markets
28%
rural economics
27%
energy
22%
hunger
22%
energy use and consumption
21%
economic development
21%
food crops
20%
agricultural products
19%
food availability
18%
agriculture
13%
carbon
12%
oils
11%
crops
9%
Engineering & Materials Science
Crops
83%
Fossil fuels
58%
Biofuels
33%
Crude oil price
22%
Carbon
22%
Energy security
18%
Agriculture
16%
Substitution reactions
14%
Fuel consumption
13%
Availability
10%
Economics
9%