blue
building
business
chimney
climate
coal
condensation
construction
contamination
cool
cooling
cylindrical
danger
ecology
electric
electrical
electricity
energy
environment
evaporation
factory
generate
global
heat
high
industrial
industry
infrastructure
landscape
night
plant
pollution
power
production
pylon
radiation
sky
smoke
station
steam
technology
tower
toxic
turbine
vapor
water