air
atmosphere
carbon
chemical
chimney
climate
climate change
co2
copy space
damage
danger
dioxide
dirty
ecology
emissions
energy
environment
environmental
factory
fumes
gas
global
global warming
industrial
industry
manufactory
manufacturing
nature
outdoors
pipe
pollute
polluting
pollution
power
power plant
skull
sky
smog
smoke
smokestack
station
technology
toxic
warming
waste