atmosphere

blastfurnace

bright

chemical

clean

cloudless

complex

construction

cooling

dioxide

ecology

energy

environment

equipment

factory

foundry

fuel

furnace

gas

global

gray

heat

heavy

high

industrial

industry

lighting

manual

metallurgical

metallurgy

pipe

plant

pollution

power

sky

smog

smoke

sunlight

technology

thermal

thick

tower

toxic

tube

two

wire

work