機器
big
black
brown coal
carbon
coal
coal mine
coal mining
construction site
destruction
dig
digger
earth
ecology
electricity
energy
environment
environmental
excavation
excavator
exploitation
extraction
fossil
fossil fuel
fuel
geology
global warming
industrial
industry
landscape
large
lignite
machinery
mine
mineral
mining
ore
oredeposit
pit
pollution
power
production
quarry
surface mine
sustainable
work