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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.
Although most solar panel installations will go on roofs, this isn't always an option. Learn about solar pergolas, ground-based solar arrays and other ways in which you can install solar panels in your home.
Wireless Internet is very popular, but there are rules relating to how it can be used - and connecting to your neighbour's access points may get you in a lot of trouble.