Two things:
1. Go to www.morningstar.com ... you can join for free and if you search "green investing" they have some guides
2. Funny call at the office from the local gas company this week.
Two years ago, I had to plan and manage the gutting and total renovation of my office building. I got the board to accept a budget that included 10% being devoted to replacing the HVAC system with 90% efficiency furnaces. The economic rationale being a 4 year payback on the investment.
This week, I get a call from Vectren (the gas company) to say that my building "showed up on a report".
"Oh", I asked..."Is that a problem? What report?"
"Well", she said, "there's been a material change in your gas utilization."
"Oh", I said, "that doesn't surprise me"...and I explained how much we invested in the HVAC and the expectation of higher efficiency...yada yada yada
"Well", she said, "that's great, but the reason you're on the list is that your gas consumption went to nearly nothing".
They came and checked the meters yesterday...and the high efficiency investment reduced our gas consumption to nearly nothing in a 6,000 square foot, 50 year old building, with 23 employees and hundreds of customers coming and going constantly
How 'bout that! My guess is that the payback is less than 4 years at current prices...
I will admit that I'm not a naturally "green" person although I've always respected the cause...but when you combine good stewardship of the environment with good economics, you will achieve wide scale change in behavior. This is where we are today...