To those of us in the industry, clean-tech deployment in the U.S. is still a long way from what it could or should be. But as was seen in last week's release of Clean Edge's 2012 State Clean Energy Index, there are plenty of signs of positive momentum, especially in light of how far the industry has come from a nascent, specialized niche a decade ago. Consider the following findings from the Index, our third annual ranking of all 50 states in clean-energy leadership in technology, policy, and capital: