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There's nothing more efficient than using a completely renewable energy source. Find out how things like wind- and solar-generated electricity can help you to improve your energy efficiency.
If your floorboards or parquetry floor are looking tired and worn, a good polish may be all that's needed to rejuvenate them.
The difference between an efficient light globe and an inefficient one is amazing. To prevent unnecessary waste, inefficient incandescent GLS globes are being phased out in Australia.