Tree

==Threats==

===Individual trees===
Dead trees pose a safety risk, especially during high winds and severe storms, and removing dead trees involves a financial burden, whereas the presence of healthy trees can clean the air, increase property values, and reduce the temperature of the built environment and thereby reduce building cooling costs. During times of drought, trees can fall into [[moisture stress|water stress]], which may cause a tree to become more susceptible to disease and insect problems, and ultimately may lead to a tree's death. Irrigating trees during dry periods can reduce the risk of water stress and death.<ref>{{cite web |url=http://texasforestservice.tamu.edu/AftertheStorm/Drought/ |title=Texas drought |work=Texas A&M Forest Service |publisher=Texas A&M University System |access-date=10 September 2012 |archive-date=7 September 2015 |archive-url=https://web.archive.org/web/20150907032456/http://texasforestservice.tamu.edu/AftertheStorm/Drought/ |url-status=live }}</ref>

===Conservation===

About a third of all tree species, some twenty thousand, are included in the [[IUCN]] Red List of Threatened Species. Of those, over eight thousand are globally threatened, including at least 1400 which are classed as "critically endangered".<ref name="FAO 2020">{{cite book |title=The State of the World's Forests 2020. Forests, biodiversity and people – In brief |publisher=FAO & UNEP |year=2020 |doi=10.4060/ca8985en |isbn=978-92-5-132707-4 |s2cid=241416114 |url=https://doi.org/10.4060/ca8985en |access-date=2 December 2020 |archive-date=20 May 2021 |archive-url=https://web.archive.org/web/20210520193013/http://www.fao.org/documents/card/en/c/ca8985en |url-status=live }}</ref>