英文關鍵字
air
atmosphere
blue
business
carbon
chemical
chimney
climate
cloud
coal
color
cooling
copter
dirty
ecology
electric
energy
environment
environmental
factory
fuel
fumes
gas
global
heat
industrial
industry
landscape
large
nuclear
oil
pipe
plant
pollution
power
radioactive
sky
smog
smoke
spewing
stack
station
steam
technology
tower
toxic
vapor
waste
white
winter