air
architecture
black and white
building
business
chimney
climate
cloud
co2
construction
contamination
contour
dark
electric
electrical
electricity
emission
energy
environmental
facility
factory
fuel
fume
generate
industrial
industry
infrastructure
manufactory
manufacturing
monochrome
outline
plant
pollution
power
power plant
production
shade
shape
silhouette
sky
smoke
station
steam
structure
system
technology
three
toxin
warm
warming