Earth & Environmental Sciences
energy source
86%
urban development
85%
alternative energy
82%
development planning
52%
city
50%
urban planning
44%
energy
43%
legislation
39%
document
33%
project
23%
gas
22%
energy market
20%
alternative fuel
18%
oil
17%
liquefied natural gas
17%
world
16%
solar energy
15%
biofuel
15%
poverty
15%
environmental risk
15%
solar wind
15%
shale
11%
hydrogen
11%
statistics
10%
demand
9%
industry
9%
economics
8%
resource
8%
sea
8%
Physics & Astronomy
energy sources
100%
sectors
77%
energy
26%
oils
22%
liquefied natural gas
19%
gases
19%
hydrogen fuels
19%
windpower utilization
19%
shales
18%
economy
16%
solar energy
14%
economics
13%
solar wind
12%
resources
12%
industries
10%
statistics
9%
Social Sciences
social inequality
88%
poverty
62%
post-socialist country
19%
socialist state
16%
cultural capital
13%
socialism
13%
social class
11%
Social Policy
11%
Russia
9%
trend
6%
economics
5%