Change classifiers in setup.py?

Are those two really necessary:

    'Environment :: Other Environment'
    'Natural Language :: English'

?

If we mention

    'Programming Language :: Python :: 3'

... we should also mention

    Programming Language :: Python :: 2

... or

    Programming Language :: Python :: 2.6
    Programming Language :: Python :: 2.7

Also, if we mention

    'Programming Language :: Python :: Implementation :: PyPy'

... we should probably also mention

    Programming Language :: Python :: Implementation :: CPython