機器
africa
air
atmosphere
carbon
chimney
climate change
coal
cooling
damage
dioxide
dirty
effect
electric
electricity
emissions
energy
engineering
environmental
footprint
fossil
fuel
gas
generation
global warming
greenhouse
grid
industrial
industry
inside
johannesburg
monoxide
plant
pollution
power
radiator
site
smoke
south africa
station
steam
structure
supply
technology
tower
vents