Are Washington State's carbon limits actually reducing the state's carbon footprint?

Some Republicans in Washington State Legislature want quicker access to results for lower carbon emissions from the state to measure if things like Cap and Trade are actually working.

Personally, I have a different measure. What do we get in return from the money collected? It could be bringing us less traffic, expanded bus service, more trains to Spokane, than only one train that arrives after midnight, and so forth. Worth it.

As for emissions from this state, I think it's working, somewhat. Not always an easy measure, due to other factors clouding the results; such as state population, continued car addiction and economic growth. In spite of these other factors, clouding the measurement of results, are carbon emissions, from our state, actually going, down?