Greening Co-ops

This article in yesterday's NYT struck a note with me. My co-op has talked a bit about what green choices we can make as we embark on some major structural work. The NYT points out how hard it is to convince co-op and condo members to spend on something that won't pay itself off for years if not decades, but they don't talk much about what kind of grants/subsidies are available for co-ops, which is something I would be curious to know more about.