At the workshop in A Toxa I attended in late June, Richard Schmalensee presented findings of a yet to be released MIT report on the "Future of Solar". This will be part of their series on the future of energy. He was skeptical of how much of a role solar can play any time soon in addressing the climate issue. It's not clear that the costs of solar can come down a lot more when most of the costs are now in the non-silicon components. There is also the issue of rare materials needed for alternatives to silicon. Then there is the intermittency / storage issue. Yes, we keep hearing about storage breakthroughs, but they aren't yet commercial products. And even when they will be they will add further huge costs to the cost of solar. There is a need for new transmission infrastructure to the renewable locations. Electricity markets may need to be reformed again to handle the intermittent new renewables effectively. Back in April, I noted that Ottmar Edenhofer stated that there was an increasing realisation of the difficulties of integrating renewable energy on a large scale into electricity supply systems. These are some of the issues alluded to and the reason that CCS and other alternatives are getting renewed consideration.