I haven’t signed up for any challenges yet, but I personally think that I’ve already been doing pretty darn good job conserving. I don’t purchase bottled water, I bring my own bags to grocery shopping, water lawn only 3 times a week, dry most of clothes under the sun, etc. Our house was built in 2000, and it came w/ water and energy conserving devices. HONDA Insight was my car before I got kids, and now my husband drives it to work. HOWEVER, even consciously trying my best to be good to the earth, I know for sure that I’m “consuming” much more by just living in this country….......