Talking of green: Brenda has given me a book ' Shades of Green' by Paul Waddington. As the title implies, it gives varying degrees of greenness for a whole range of products and activities. I've only dipped into it so far but have been fascinated by some of the entries. A few examples:
Courgettes: Deep green is no courgettes because they have little nutritional value and are normally imported. Pale green is organic courgettes from Europe in spring and autumn only.
Bicycles: Quite green is a steel bike - better than aluminium because less energy is used in manufacture and they last longer. Not even a bit green - nothing: all bikes are green.
Coffee: Deep green is fairtrade, organic, shade-grown coffee. Dark green is dandelion-root coffee - but this has no caffeine. Not even a little bit green is decaffeinated instant coffee.
I think I'll be returning to this.