The Forest Stewardship Council (FSC) is an internationally recognised non-profit organisation that supports sustainable, economically viable and socially beneficial forestry management. Timber can be certified by the FSC if it is verified as being extracted from an FSC certified forest that meets the Principles and Criteria of Forest Stewardship.

Fossil fuels refer to fuel deposits derived from organic matter deposited into the various layers of the earth through the death and accumulation of organic life forms. Because of this they are considered as non-renewable sources of energy. They include mainly coal, gas and oil. When burned, the carbon dioxide from these fuels is released into the atmosphere, contributing to global warming.