Evidence is reviewed supporting the hypothesis that observed regional changes in visibility and ecosystem health result from air pollution.
(Evidence; is reviewed; supporting the hypothesis) (Evidence; supporting; the hypothesis that observed regional changes in visibility and ecosystem health result from air pollution) (the hypothesis; observed; regional changes in visibility and ecosystem health result from air pollution)
Evidence Evidence the hypothesis
is reviewed supporting observed
supporting the hypothesis
the hypothesis that observed regional changes in visibility and ecosystem health result from air pollution
regional changes in visibility and ecosystem health result from air pollution