Much sparring of late between the Alberta Progressive Conservatives and their Tory comrades in Ottawa over what to do about those darn greenhouse gas emissions. And as international climate change talks in Copenhagen appear on the horizon–they’ll take place in December–the rhetoric has only been heating up. Earlier this week, leaked talking points distributed among Alberta MLAs revealed the province’s still-seething anger over a perceived lack of communication from Ottawa on the issues. A national, much less a broader, carbon market has always been a no-go for the provincial Tories. Then comes Environment Minister Jim Prentice’s announcement of just that. Could this—tentative approval of national offsets—ignify an abrupt thaw?