air

bionomics

blaze

burning

chimneys

clogging

cloud

coal

contamination

contemporary

damage

day

ecology

economy

emissions

energy

environmental

factory

fire

flambeau

flame

fossil

fuel

gas

gasoline

global

hazard

heat

high

industrial

industry

inferno

natural

nature

oil

ozone

petroleum

pollution

power

recession

refinery

sky

smog

torch

toxic

tube

urban

warming