英文關鍵字
air
background
blue
building
chemical
chimney
climate
co2
coal
color
construction
cooling
day
dirty
ecology
emissions
energy
environment
environmental
exhaust
factory
fuel
gas
global
heat
industrial
industry
infrastructure
large
nature
nuclear
pipe
plant
pollution
power
refinery
sky
smog
smoke
stack
station
steam
structure
technology
tower
toxic
vapor
waste
white
winter