Earth & Environmental Sciences
sustainability
65%
nitrogen
52%
education policy
50%
city
49%
ecology
45%
organization
42%
urban ecology
42%
educational institution
42%
higher education
38%
environmental policy
29%
fixation
28%
education
24%
budget
24%
combustion
22%
urban area
22%
food
20%
animal
19%
wastewater
19%
policy
17%
program
15%
project
15%
Agriculture & Biology
nitrogen balance
100%
educational institutions
82%
case studies
74%
ecology
65%
environmental policy
43%
higher education
42%
ecologists
35%
education programs
34%
combustion
31%
urban areas
30%
education
29%
wastewater
28%
nitrogen
17%
animals
12%
Social Sciences
ecology
82%
sustainability
65%
environmental policy
28%
education
26%
educational institution
26%
urban area
25%
animal
23%
budget
23%
food
20%