blue
burner
catalyst
chemical
chimney
climate
complex
distill
ecology
electricity
emission
energy
engine
environment
exhaust
factory
float
fuel
fume
gas
gasoline
global
heavy
industrial
industry
island
kyoto
landscape
manufacturing
metal
oil
petrochemical
petroleum
plant
pollution
power
process
production
refinery
sky
smog
smoke
smokestack
station
steam
structure
supply
technology
thermal
toxic