英文關鍵字
aerial
air
atmosphere
blue
business
chemical
chimney
city
climate
coal
copter
dioxide
dirty
ecology
electrical
energy
environment
environmental
exhaust
factory
footprint
fuel
gas
global
heat
heavy
industrial
industry
infrastructure
pipe
plant
pollute
pollution
power
radioactive
refinery
sky
skyline
smog
smoke
spewing
stack
station
steam
structure
technology
tower
toxic
waste
white