[pen] Dunno about Darren, but I would feel exactly that (and frequently do). We've too few trees as it is, without wasting them on pointless letters, cards etc.
(Projoy) You really can't be allowed to get away with that. The proportion of paper in actual letters compared with the total amount of paper (newspapers, junk mail etc) that comes through my letterbox is very small. In any case, we're not short of trees; there are many more than there were 40-50 years ago, everywhere. To be honest, I'm not that keen on trees, they spoil the view and at one time threatened to undermine my house. Rather overrated, I feel.