I think a big use of discussions could be the which is a better choice. This would include questions like "propane vs charcoal in a grill?", "which of these products is better to buy?", "drive versus fly for a vacation?"
Many of these would have answers depending on situations etc, so discussion would be useful.
Any chance of getting this section added to the discussions page?
SixLinks Developers' response:
This has now been implemented as the Sunday Sustainability Showdowns. Please post your ideas over in the discussion!