Incidentally, there have been vague rumors recently that China has been field-testing some new anti-satellite weaponry by pointing it at US satellites. I will just guess that this is no coincidence, and that you're seeing some geopolitics in action here.
Also: The directive for civil space exploration says that NASA's mandate is to "advance fundamental scientific knowledge of our Earth system, solar system, and universe." The part about Earth was removed in an earlier version, and apparently got reinstated. (This has to do with whether NASA should research climate -- n.b. the GISS-E group that does the current gold standard climate modelling is partially based out of NASA)
