英文關鍵字
air
atmosphere
black
blue
breathe
brick
business
carbon
change
chemistry
chimney
climate
cloud
coal
coming
conservation
contaminate
cooling
destructive
dioxide
dirty
ecological
ecology
electricity
emission
energy
environment
environmental
exhaust
factory
fog
fuel
fume
gas
gasoline
global
greenhouse
heating
industrial
industry
inhaling
isolated
manufacture
manufacturing
natural
objects
outdoors
ozone
pipe
plant
pollute
polluter
pollution
power
refinery
refining
sky
smog
smoke
smokestack
stack
station
steam
stovepipe
technology
tower
toxic
trail
vapor
warming
white