My favourite is the wind powered air-conditioning system we have at the moment (called a window)... Open for cool air to flow through, close to increase the temp.
Ironically it functions better than the system at the office.
The jurys out on our eco-balls - they just to not clean the washing as well as we had expected so we sometimes have to use commercial methods to get clothes clean and are therefore forced to not be as eco-friendly as we would like to be
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