Earth & Environmental Sciences
energy source
100%
student
75%
biofuel
67%
energy
50%
cost
46%
curriculum
30%
vehicle
30%
thermodynamics
29%
ethanol
24%
alternative energy
23%
education
21%
modeling
21%
price
21%
decision making
19%
passenger transport
18%
literacy
17%
engineering
16%
biofuel production
16%
environmental cost
15%
biomass
15%
policy
15%
economic system
15%
economics
14%
wind power
14%
environmental performance
14%
smelting
13%
project
13%
trend
12%
oil production
12%
research program
12%
firm
12%
research and development
12%
school
11%
alga
10%
socioeconomics
10%
life cycle
10%
stakeholder
10%
forecasting
10%
society
9%
combustion
9%
sustainability
9%
steel
9%
forecast
9%
public
8%
method
8%
decision
8%
services
8%
oil
7%
climate change
7%
program
6%
material
5%