A while back I mentioned a McKinsey Global Institute report showing that efficiency is the fastest, cheapest way to cut global GHG emissions.

Now McKinsey’s got a new report out, making a heretical claim: even though homeowners could vastly improve energy efficiency and save tons of money over the long term with current technologies, there won’t be widespread adoption of those technologies without market intervention — i.e., stronger regulations. Whatever will the market fundies think?

Speaking of efficiency, Joel Makower’s got a good roundup of recent efficiency news.