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"Thanks to the separation of church and state, it could now be argued that it is unconstitutional for the government to use AGW as the basis of any policy."
You could if the ruling applied to the US. But the ruling was in the UK where there is still, regrettably, an established church.
It's a religion in difficulty, as more people begin to take a step back and see that they are being required to act against their own reasonable interests: