The police force cannot be completely independent of the executive government.
People are wiser than we are willing to attribute to them.
Two successive commissioners in London police were fired by the mayor that came into office. That doesn't mean the police in London is not independent and does not exercise powers. Ultimately it is the political executive that has to answer.
Evidence points out that if you raise tariffs too much it will increase smuggling.
Police can only act on intelligence.
It is possible that, post-Kyoto, the developed countries will recognise the requirements of the developing world.