My impression is that carbon offset plans are a rather imperfect and somewhat temporary solution - but still seem to be a step in the right direction, and at least signal consumer demand for green solutions. Despite its somewhat half-hearted nature, even these kinds of plans can be hard to find. I'm buying a house in Ohio, and I've found carbon-offset plans for my electricity and natural gas, but the house has an oil-burning furnace, and I'm having trouble finding any fuel oil services that do more than e.g. mention "oil is cleaner than gas because blah blah blah". I've seen a few for different states (and countries), but so far have come up short for Ohio.
Is there a site with a comprehensive listing of green-ish services, ideally filterable by state/county (and hopefully including heating oil as one of the services)?