英文關鍵字
air
architecture
background
blue
building
chemical
chimney
climate
co2
coal
cooling
copter
dirty
dust
ecology
electric
electrical
energy
environment
factory
fog
fuel
gas
global
heat
industrial
industry
landscape
large
nature
pipe
plant
pollution
power
radioactive
sky
smog
smoke
spewing
stack
station
steam
technology
tower
toxic
warming
waste
white
winter