alternative

business

clean

construction

eco

ecology

electric

electricity

energy

engineer

engineering

environment

environmental

factory

fuel

future

generation

generator

green

hardhat

illustration

industry

innovation

landscape

light

line

maintenance

male

man

mill

nature

nuclear

oil

people

plant

power

professional

project

renewable

set

station

sustainable

technology

turbine

turbines

wind

windmill

woman

work

worker