英文關鍵字
air
blue
building
business
chemical
chimney
climate
cloud
co2
coal
cooling
dirty
ecology
energy
environment
environmental
factory
fog
footprint
fuel
fumes
gas
global
heat
heavy
industrial
industry
large
nature
oil
pipe
plant
pollute
pollution
power
sky
smog
smoke
spewing
stack
station
steam
steel
structure
technology
tower
toxic
vapor
waste
white