Carbon Positive: The uphill push toward a federal US cap and trade scheme and emissions regulation met a steeper incline this week as new political obstacles in Congress put a federal emissions trading scheme in further doubt. As a result, attention is already turning back to the states and regional approaches to climate action. Already facing a difficult task in the Senate to secure the required votes, Democrat cap and trade proponents have lost a vital seat to the Republicans. Murmurings among some …