A new thought from John Grant: lessening.
I'll let him explain...
"Whatever your starting point the goal is to make a little progress week in week out, some local fruit and veg, a lightbulb here an inessential trip cancelled there. It's all about a direction of change, not starting out green. I like the fact that it sound a bit like lessons and I think sharing learning could be a key strand"
It's an approach that has always worked well for us. Because the fact is, once you start cutting back, if only a bit, it's always easier to cut back some more.