Earth & Environmental Sciences
agricultural method
85%
hydroponics
69%
land
28%
energy
24%
comparison
21%
energy demand
17%
water demand
17%
water
15%
agriculture
12%
geothermal power
11%
solar power
10%
wind power
9%
alternative energy
7%
budget
7%
sustainability
6%
crop
6%
statistics
5%
engineering
5%
Medicine & Life Sciences
Hydroponics
100%
Lettuce
80%
Water
33%
Agriculture
19%
Solar Energy
15%
Renewable Energy
14%
Southwestern United States
13%
Budgets
9%
Statistics
6%
Social Sciences
water
39%
energy
34%
energy shortage
32%
agriculture
21%
renewable energy
13%
budget
10%
sustainability
9%
statistics
9%
engineering
7%
literature
5%
Chemical Compounds
Hydroponics
82%
Energy
23%
Geothermal Power
15%
Solar Power
12%
Reaction Yield
6%
Time
6%
Engineering & Materials Science
Agriculture
27%
Water
27%
Greenhouses
15%
Crops
14%
Solar energy
11%
Sustainable development
11%
Wind power
10%
Renewable energy resources
10%
Statistics
9%
Availability
8%