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Why do we need to be energy efficient? The less energy we use, the longer the world's natural resources, such as oil and coal, will last.
This is essentially because energy reserves will be used at a slower rate. In addition, many experts believe that being more energy efficient is the only way to slow the march of global warming.
Not saving on energy can also cause energy shortages. California has struggled badly to keep pace with its energy needs. As a result, last year the State suffered a series of 'brown-outs', which plunged large residential areas into darkness.
How energy efficient are homes in the UK?
Nearly 30% of all carbon dioxide emissions from UK power stations result directly from supplying homes with electricity.
We use twice as much lights, kettles, computers and DIY equipment now than we did during the 1970s, and by 2010 we will be using yet more - 12% more, in fact.
Much of the energy is also used to heat our homes, and this is where we could make the largest savings.
More than 40% of all heat lost in an average home is through the loft and walls.
How much can be saved?
Consequently, the Energy Trust says £5bn is wasted on energy in the UK every year.
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