Tree

===Fuel===
{{main | Wood fuel}}
[[File:Selling fuelwood.jpeg|thumb|Selling firewood at a market]]

Wood has traditionally been used for fuel, especially in rural areas. In less developed nations it may be the only fuel available and collecting firewood is often a time-consuming task as it becomes necessary to travel further and further afield in the search for fuel.<ref>{{cite web |url=https://www.un.org/womenwatch/feature/idrw/index-2008.html |title=Women watch: International Day of Rural Women |date=15 October 2008 |publisher=United Nations Inter-agency Network on Women and Gender Equality |access-date=1 August 2012 |archive-date=17 December 2011 |archive-url=https://web.archive.org/web/20111217142532/http://www.un.org/womenwatch/feature/idrw/index-2008.html |url-status=live }}</ref> It is often burned inefficiently on an open fire. In more developed countries other fuels are available and burning wood is a choice rather than a necessity. Modern [[wood-burning stove]]s are very fuel efficient and new products such as [[wood pellet]]s are available to burn.<ref>{{cite web |url=http://www.epa.gov/burnwise/ |title=Burn Wise |publisher=United States Environmental Protection Agency |access-date=27 July 2012 |date=8 May 2013 |archive-date=19 March 2021 |archive-url=https://web.archive.org/web/20210319140434/https://www.epa.gov/burnwise |url-status=live }}</ref>

[[Charcoal]] can be made by slow [[pyrolysis]] of wood by heating it in the absence of air in a [[kiln]]. The carefully stacked branches, often oak, are burned with a very limited amount of air. The process of converting them into charcoal takes about fifteen hours. Charcoal is used as a fuel in [[barbecue]]s and by [[blacksmith]]s and has many industrial and other uses.<ref>{{cite web |url=http://www.woodlands.co.uk/blog/practical-guides/how-do-you-make-charcoal/ |title=How do you make charcoal? |work=Woodlands.co.uk |publisher=Woodland Investment Management |access-date=27 July 2012 |archive-date=4 June 2012 |archive-url=https://web.archive.org/web/20120604175105/http://www.woodlands.co.uk/blog/practical-guides/how-do-you-make-charcoal/ |url-status=live }}</ref>