Fasting for lesser carbon emission

This is a good idea. Read about it the other day. Stop using any electronic gadgets for a day once a week during the fasting season this lent. To reduce carbon emission. For me that would mean not using my cellphone or notebook computer or mp3 player or tv or printer ... what else? I wonder though how much it can contribute. I wonder whether I can make do without any of them. Maybe all except the notebook computer and printer during the working week. Let us see...what about you?