Agriculture & Biology
small-scale farmers
100%
Sub-Saharan Africa
83%
biogas
81%
labor
65%
anaerobic digestion
51%
farming systems
49%
systems engineering
37%
energy
35%
pyrolysis
32%
water
24%
fish ponds
20%
finance
19%
drums (equipment)
18%
biochar
17%
plankton
16%
socioeconomics
15%
fish feeds
14%
recycling
14%
soil fertility
13%
temperature
11%
rain
11%
farms
9%
nutrients
8%
soil
7%
Earth & Environmental Sciences
biogas
72%
labor
70%
digester
65%
farming system
64%
Africa
55%
anaerobic digestion
44%
pyrolysis
26%
energy
21%
environmental constraint
18%
water
18%
fish
17%
finance
16%
sustainable use
16%
resource
16%
biochar
15%
fertility
15%
energy production
15%
rainwater
15%
dome
14%
temperature change
14%
plankton
14%
pond
12%
farm
12%
socioeconomics
12%
recycling
11%
nutrient
9%
soil
6%
temperature
5%
Engineering & Materials Science
Biogas
85%
Anaerobic digestion
58%
Personnel
56%
Water
32%
Fish ponds
28%
Pyrolysis
28%
Plankton
25%
Nutrients
18%
Balloons
18%
Domes
17%
Finance
17%
Fish
16%
Recycling
14%
Farms
14%
Temperature
11%
Soils
11%
Systems analysis
11%