Answer:

acidrain

Answer	Crossword Clue
ACIDRAIN	Falling pollution
ACIDRAIN	Polluted precipitation
ACIDRAIN	Environmental hazard

ACIDRAIN	Harmful downfall
ACIDRAIN	Pollutant linked to fossil fuels
ACIDRAIN	Environmental issue
ACIDRAIN	EPA concern
ACIDRAIN	Harmful precipitation
ACIDRAIN	Lightning by-product
ACIDRAIN	Industrial fallout
ACIDRAIN	Environmental problem

ACIDRAIN	Environmentalist's concern
ACIDRAIN	Environmental woe
ACIDRAIN	Environmental awareness topic
ACIDRAIN	One cause of deforestation
ACIDRAIN	Deleterious precipitation
ACIDRAIN	Environmental problem addressed in the Clean Air Act
ACIDRAIN	Low-pH precipitation
ACIDRAIN	Destructive precipitation

ACIDRAIN	Formerly volatile U.S.-Canada issue
ACIDRAIN	Ecological danger
ACIDRAIN	Corrosive stuff from the sky
ACIDRAIN	Harmful fall
ACIDRAIN	Environmental concern
ACIDRAIN	Perilous drops?