英文關鍵字
air
atmosphere
brown
building
carbon
chemical
chimney
climate
cloud
concept
danger
dirty
ecology
effect
energy
environment
environmental
factory
fumes
gas
generation
global
greenhouse
high
hydrogen
impact
industrial
industry
manufacturing
mist
misty
nature
nobody
pipe
plant
pollution
power
problem
sky
smog
smoke
smoky
stack
steam
steel
technology
tower
warming
white