aring
blue
boilers
chimney
chimneys
ciep
clouds
coal
contaminating
electricity
enclosing enclosing with
energetics power worker
environment engages
fabricating
fog
fumigation
greenhouse effect
hard coal
incinerating
it engages
oxide of carbon charcoal
oxide of nitrogen
power station
sky engages
smoke smoke fume smoke
technology
water engages
wyziewy