Ideas for Lent: Carbon Fast

I'm hoping to share various ideas for Lent as and when I find them. Feel free to add a comment with futher ideas. Here's another to be going on with. Carbon Fast: "'As we pray daily for God's will to be done on earth, as it is done in heaven, the Carbon Fast is a practical step towards a fairer world, a sustainable planet and the earthing of heaven. Join us as the Carbon Fast goes global in 2009!'"