ADJECTIVE (2)

1. of or relating to the external conditions or surroundings;
- Example: "environmental factors"

2. concerned with the ecological effects of altering the environment;
- Example: "environmental pollution"

The Collaborative International Dictionary of English v.0.48:

environmental \environmental\ adj.
   1. of or pertaining to the environment; as, environmental
      factors.
      [WordNet 1.5]

   2. of or pertaining to the environment (definition 2); as,
      environmental pollution; environmental disaster;
      environmental cleanup; environmental deterioration.
      [WordNet 1.5]

            THOUSANDS of dead fish and other marine species,
            suffocated by a rotting, glutinous morass which
            spreads over kilometres of coral reefs.
            This scenario has all the hallmarks of a unnatural
            environmental disaster resulting from environmental
            negligence. However this isn't the case, instead the
            cause -- coral spawn slick deoxygenation -- is a
            natural event which has the potential to occur
            periodically on the reefs of the West Pilbara.
                                                  --Michael
                                                  Borowitzka
                                                  ("Natural
                                                  event spawns
                                                  environmental
                                                  disaster" in
                                                  Murdoch News,
                                                  October 12,
                                                  1995)