A1980, I'm with you on the washing machine temperature thing. I did my washing on 60 when we tried cloth nappies, and it was horrific how much the electricity consumption in the house skyrocketed. I still think the environmental benefits are ultimately in question - you can find stats to support either argument.
Using disposables has far, far less impact than all the families in China and India acquiring washing machines, imho. We do recycle and compost more and more, which is great and use fuel-efficient vehicles for essential journeys, but we mustn't lose sight of the bigger picture, either. It is possible to become a bit too egocentric about the whole issue.
Back to the humour of it, though, I've had a few bitchy conversations with DH about the local eco-warriors who talk so earnestly and piously to anyone who will listen about how low impact their lifestyle is. I've often said that they probably all sleep on beds of nails at night (less environmental impact than a mattress) and sit on a huge spike on a Sunday for a treat.