air
atmosphere
blue
building
chemical
chimney
cloud
coal
construction
danger
ecology
electric
electrical
electricity
emissions
energy
engineering
environment
factory
fuel
fume
gas
generation
global
heat
high
industrial
industry
nuclear
oil
pipe
plant
pollute
pollution
power
power plant
production
red
sky
smog
smoke
station
steam
tall
technology
thermal
tower
toxic
vapor
white