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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Environmental problems 6 letters:

SPILLS: Environmental problems
ASHPILE: Potential environmental problem for a coal user
SMOG: Environmental problem
ACIDRAIN: Environmental problem
ACIDRAIN: Environmental problem addressed in the Clean Air Act
SMOG: Beijing environmental problem
ALAND: __ on Fire (book about Bangkok environmental problems)
FORESTFIRES: Major environmental problem in California