air
area
atmosphere
background
blue
brick
business
chimney
clean
climate
cloud
construction
contamination
ecology
electricity
energy
environment
exhaust
factory
fuel
global
green
heat
high
industrial
industry
landscape
manufacturing
pipe
plant
pollution
power
progress
refinery
silhouette
sky
smoke
station
sunny
tall
technology
thermal
tower
toxic
tree
trees
warming
waste
white
work