alarm
atmosphere
attrition
barren
chimney
climate
concept
conceptual
crack
death
depletion
desert
destroy
destruction
devastation
drought
dry
ecology
economic
emission
energy
environment
environmental
fumes
future
gas
global
heat
hot
hothouse
industrial
industry
landscape
lifeless
nature
ozone
pipe
plant
pollutant
pollute
pollution
power
sky
smog
smoke
smokestack
sunset
toxic
vapor
warming