英文關鍵字
air
atmosphere
belch
belching
billowing
blue
carbon
catastrophe
chemical
chimney
climate
cloud
coal
damage
danger
dioxide
dirty
ecological
ecology
emission
energy
environment
environmental
exhaust
factory
fuel
fume
gas
global
heat
industrial
industry
manufacturing
ozone
pipe
plant
pollute
polluting
pollution
power
sky
smog
smoke
smokestack
station
steam
tower
toxic
warming
waste