This is because of the availability of the banked allowances that can be used by sources to meet emissions caps in 2007 and beyond.
The banked allowances provide a certain amount of leeway where the emissions cap was concerned and sources are happy about that.
mnli hypothesis: The banked allowances provide a certain amount of leeway where the emissions cap was concerned and sources are happy about that. premise: This is because of the availability of the banked allowances that can be used by sources to meet emissions caps in 2007 and beyond.