air

black

blaze

blue

burn

burner

business

carbon

cloud

combust

crisis

crude

damage

danger

dioxide

ecology

energy

environment

factory

fire

flame

flaming

flare

fossil

fuel

gas

gasoline

gray

industrial

industry

methane

oil

orange

petrochemical

petroleum

pink

pipe

pipeline

pollution

power

red

siberia

sky

smoke

sundown

sunset

technology

torch

tower

yellow