dexter at this point in time it is as you say mostly smaller...

dexter at this point in time it is as you say mostly smaller companies involved. But there is a growing number of them and together they equate to a substantial growing business not only in renewables but also in clean coal technologies, nuclear etc.
If as it appears will happen that carbon trading becomes a reality then these companies and many other newcomers will grow rapidly as will the beauracracy created to manage it and a huge industry will be born.
But only if greenhouse theory can be sold as fact, so there is now plenty of business interest in selling it.
Dave R.