We had some really great threads last year, with the following four nominated for the Thread of the Year award in this January's Environment Site Awards ceremony.

I think they're great and give a real sense of what the forum is capable of, so if you're looking for a reason to join, check these out.
Sheffied Energy Recovery Facility | Nanosolar breakthrough: Solar cheaper than Coal | What lessons should be learned from summer floods | Can you be a capitalist and environmentalists at the same time?