blue
boat
chemical
chemistry
chimney
construction
crane
economy
energy
engineer
engineering
environment
equipment
factory
fuel
gas
gasoline
heavy
hook
industrial
industry
light
manufacturing
oil
petrochemical
petroleum
pipe
pipeline
plant
pollutant
pollute
pollution
production
refine
refinery
river
steam
storage
structure
sustainability
sustainable
tank
technology
tower
water
worker