There are many millions of homes around the world that have been built without real consideration of energy efficiency and much heat is lost during winter and gained during summer through glass windows. There's a way to double glaze your windows that costs hundreds instead of thousands.

One of the planet's most versatile grasses; bamboo can be eaten, worn, used to build shelter and boats - it's an amazing product of nature.

Is your hot water system about to give up the ghost? Can't afford solar water heating? Consider a tankless system. For many households, it will provide substantial energy savings - and that's good for your budget and the environment.