air
burning
bush
carbon
carbon dioxide
chemical
chimney
climate
dioxide
dirty
district heating
emission
energy
environment
environmental
evaporation
exhaust
factory
forest
frame
fuel
fume
gas
generation
global
global warming
greenhouse
heating
heavy
industrial
industry
labdscape
manufacturing
pipe
plant
polluted
pollution
power
power station
production
sky
smog
smoke
stack
station
steam
technology
tower
tree
vapor