燃やす
air
atmosphere
carbon
chemical
chimney
climate
co2
combustible
contamination
danger
dioxide
dirty
disaster
dust
ecology
ecosystem
emissions
energy
environment
environmental
exhaust
factory
fumes
gas
global
globe
heavy
industrial
industry
manufacturing
nature
plant
pollute
pollution
production
sky
smog
smoke
smokestack
steam
technology
tower
toxic
vapor
warming
world