environmental
air
atmosphere
building
carbon
chemical
chimney
climate
cloud
coal
complex
concept
dioxide
dirty
ecology
emission
energy
environment
exhaust
factory
fossil
fuel
fumes
gas
generation
global
hot
industrial
industry
ozone
pipe
plant
pollute
polluting
pollution
power
power plant
production
refinery
sky
smoke
station
steam
structure
technology
tower
vapor
warming
white