The policy is quite clear, to comment on a matter of raw science fact there is no need for Executive permission.
To comment on the Policy of Government in any matter needs Executive approval. As Policy is a nebulous thing that is open to interpretation and flavor of Government then any scientific comment can then be misconstrued by any uninformed partisan to suit their cause.
The major problem is how ignorant most people are when it comes to the real world complexities of Science.
To see the totally scientifically ignorant snatching irrelevant data to prove their side of the current AGW debate should give you an idea what a dog's breakfast these matters can become if handled incorrectly.
Bert
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