Monetizing my carbon footprint tool?

So I'm in the online tool creation niche. I'm thinking of creating a carbon footprint calculator tool for the local (national) market.

The tool would work by asking a series of questions. Then estimate your carbon footprint and suggest improvements you could make.

Also, it would suggest various grants that are available to you to do things like switching to an electric vehicle, insulate your home or install solar panels etc...

While I'm happy to do my bit for the environment. I'll also need to cover development costs and marketing costs. Which brings me to the question of monetization.

I'm presuming that there are contractors, car dealerships etc... that would like to get access to local, segmented, environmentally concerned individuals that are looking to make some changes.

How exactly would you go about monetizing such a tool? I'm thinking I could collect email addresses and locality. Then (with user permission) pass that info on.

Maybe there's a better way? How should I approach the dealerships and contractors? Should i charge per lead or on a commission basis (per job)?