Environmentally friendly home construction refers to the "green" methods used to create a home. An environmentally friendly home will be constructed with recycled materials and wood from a renewable source. Alternative materials, such as bamboo, are very common. Bamboo is a very abundant resource that grows quickly, and it is also quite strong. It would be used to create laminate wood floors without sacrificing more trees. An ideal eco-home would also employ many devices and constructs that would lessen the home's carbon footprint. Geothermal heating systems and solar panels are among the most sophisticated options for eco-friendly homes. Improving the efficiency of a home will not only have beneficial effects on the environment, it will also save quite a bit of money. While the cost of some of the most complex eco-homes is exorbitant, the amount of money saved on energy will return the investment over time.