Very briefly, there are costs to both action and inaction, and I don't think it's very easy to estimate them.
I would just look around the world and, as someone has already mentioned, look at those countries that have done the best job of de-carbonizing their economy, making it less energy intensive and less carbon intensive, countries like Norway, Denmark, and Germany. They've hardly been impoverished. They're doing very well.
I think we should be trying to take a leaf from their book, instead of always moaning and groaning about the cost of things that are proposed. Many of these things will pay for themselves; certainly energy efficiency pays for itself. This committee has heard from industries that have acted out of their own self-interest to reduce their costs by reducing their energy use. There are always questions of timing, of course.