英文關鍵字
against
air
atmosphere
blue
carbon
chemical
chimney
clear
climate
cloud
clouds
contamination
dioxide
dirty
ecology
emissions
energy
environment
environmental
exhaust
factory
fuel
gas
global
high
industrial
industry
isolated
manufacturing
nature
pipe
plant
pollution
power
problem
red
sky
smog
smoke
smokestack
smoking
stack
stacks
station
steam
technology
tower
toxic
vapor
warming
white