Earth & Environmental Sciences
travel cost
100%
natural area
82%
valuation
75%
protected area
63%
economics
41%
services
29%
lodging
17%
method
15%
fee
13%
willingness to pay
13%
social impact
13%
regional development
13%
economic impact
12%
cost
12%
environmental quality
12%
estimation method
12%
literature review
11%
appraisal
11%
income
10%
protocol
9%
price
9%
society
9%
biodiversity
8%
market
8%
food
8%
plan
8%
public
7%
science
7%
demand
7%
ecosystem
6%
methodology
6%
analysis
3%
Agriculture & Biology
systematic review
92%
travel
75%
economic valuation
74%
conservation areas
67%
tourists
25%
ecosystem services
21%
methodology
19%
public investment
16%
social impact
14%
food prices
13%
willingness to pay
13%
environmental quality
12%
market value
12%
lodging
12%
consumer demand
12%
information processing
11%
economic impact
11%
managers
10%
exercise
9%
income
8%
biodiversity
8%
ecosystems
7%
protocols
7%
synthesis
5%
Medicine & Life Sciences
Economics
55%
Systematic Reviews
52%
Costs and Cost Analysis
44%
Biodiversity
19%
Fees and Charges
17%
Social Change
17%
Social Responsibility
16%
Ecosystem
15%
Income
11%
Meta-Analysis
10%
Food
9%
Databases
8%