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Some researchers state that forests do not only provide benefits, but can in certain cases also incur costs to humans.<ref name="R Nasi, S Wunder 2002">{{cite conference|first1=R|last1=Nasi|first2=S|last2=Wunder|first3=JJ|last3=Campos A|title=Forest ecosystem services: can they pay our way out of deforestation?|book-title=UNFF II|location=Costa Rica|date=11 March 2002|url=http://www.cifor.org/publications/pdf_files/Books/BNasi0201.pdf|url-status=live|archive-url=https://web.archive.org/web/20141204162356/http://www.cifor.org/publications/pdf_files/Books/BNasi0201.pdf|archive-date=4 December 2014}}</ref><ref>{{cite report|first1=Lucy|last1=Emerton|year=1999|title=Mount Kenya: The Economics of Community Conservation|series=Evaluating Eden Series|issue=Discussion Paper No.4|type=Community Conservation research Working Paper|publisher=University of Manchester Institute of Development Policy and Management|url=http://pubs.iied.org/pdfs/7797IIED.pdf?origin=publication_detail|url-status=live|archive-url=https://web.archive.org/web/20141204162356/http://pubs.iied.org/pdfs/7797IIED.pdf?origin=publication_detail|archive-date=4 December 2014}}</ref> Forests may impose an economic burden,<ref>{{cite report |last1=Lette |first1=Henk |last2=de Boo |first2=Henneleen |title=Economic Valuation of Forests and Nature A support tool for effective decision-making |url=http://library.wur.nl/WebQuery/wurpubs/fulltext/118103 |year=2002 |series=Theme Studies Series 6 Forests |location=Ede, The Netherlands |publisher=Forestry and Biodiversity Support Group, International Agricultural Centre (IAC), Wageningen National Reference Centre for Agriculture, Nature Management and Fisheries (EC-LNV) |access-date=16 February 2022}}</ref><ref>{{cite book|editor-first=Joshua T.|editor-last=Bishop|year=1999|title=Valuing Forests A Review of Methods and Applications in Developing Countries|publisher=Environmental Economics Programme, International Institute for Environment and Development (IIED)|location=London|url=http://siteresources.worldbank.org/INTEEI/214574-1153316226850/20486370/ValuingForestsAReviewOfMethodsAndApplicationsInDevelopingCountriesJuly1999.pdf|url-status=live|archive-url=https://web.archive.org/web/20151123100829/http://siteresources.worldbank.org/INTEEI/214574-1153316226850/20486370/ValuingForestsAReviewOfMethodsAndApplicationsInDevelopingCountriesJuly1999.pdf|archive-date=23 November 2015}}</ref> diminish the enjoyment of natural areas,<ref>{{cite journal|last1=Gray|first1=Emma F.|last2=Bond|first2=William J.|title=Will woody plant encroachment impact the visitor experience and economy of conservation areas?|journal=Koedoe|year=2013|volume=55|number=1|issn=0075-6458|doi=10.4102/koedoe.v55i1.1106|doi-access=free}}</ref> reduce the food-producing capacity of grazing land<ref>{{cite journal|first1=R.J.|last1=Scholes|first2=S.R.|last2=Archer|year=1997|title=Tree-Grass Interactions in Savannas|journal=Annual Review of Ecology and Systematics|volume=28|pages=517–44|url=http://cals.arizona.edu/research/archer/reprints/Scholes_Archer_1997_AnRevEcolSys.pdf|doi=10.1146/annurev.ecolsys.28.1.517|url-status=dead|archive-url=https://web.archive.org/web/20141204185831/http://cals.arizona.edu/research/archer/reprints/Scholes_Archer_1997_AnRevEcolSys.pdf|archive-date=4 December 2014}}</ref> and cultivated land,<ref>{{cite book|first1=David|last1=Pimentel|first2=Marcia H.|last2=Pimentel|year=2007|title=Food, Energy, and Society|publisher=CRC Press}}</ref> reduce biodiversity,<ref>{{cite journal|first1=Zakary|last1=Ratajczak|first2=Jesse B.|last2=Nippert|first3=Scott L.|last3=Collins|year=2012|title=Woody encroachment decreases diversity across North American grasslands and savannas|journal=Ecology|volume=93|issue=4|pages=697–703|pmid=22690619|url=http://www.k-state.edu/ecophyslab/pdf%27s/Ratajczak,%20Nippert,%20and%20Collins.%202012.%20Ecology.pdf|doi=10.1890/11-1199.1|url-status=live|archive-url=https://web.archive.org/web/20150307025203/http://www.k-state.edu/ecophyslab/pdf's/Ratajczak,%20Nippert,%20and%20Collins.%202012.%20Ecology.pdf|archive-date=7 March 2015|doi-access=free}}</ref><ref>{{cite journal|first1=Catherine L.|last1=Parr|first2=Emma F.|last2=Gray|first3=William J.|last3=Bond|year=2012|title=Cascading biodiversity and functional consequences of a global change–induced biome switch|journal=Diversity and Distributions|volume=18|issue=5|pages=493–503|url=https://www.researchgate.net/publication/259397524|doi=10.1111/j.1472-4642.2012.00882.x|s2cid=84089636|url-status=live|archive-url=https://web.archive.org/web/20170131191537/https://www.researchgate.net/profile/Emma_Gray5/publication/259397524_Cascading_biodiversity_and_functional_consequences_of_a_global_change-induced_biome_switch/links/0046352b6eb15ccff5000000.pdf|archive-date=31 January 2017|doi-access=free}}</ref> reduce available water for humans and wildlife,<ref>{{cite conference|last1=Wilcox|first1=B.P.|last2=Kreuter|first2=U.P.|year=2003|title=Woody plant: streamflow interactions as a basis for land management decisions in drylands|conference=Proceedings VIIth International Rangelands Congress|pages=989–96}}</ref><ref>{{cite journal|last=Scott|first=D.F.|year=1999|title=Managing riparian vegetation to sustain streamflow: results of paired catchment experiments in South Africa|journal=Canadian Journal of Forest Research|volume=29|issue=7|pages=1149–51|url=http://researchspace.csir.co.za/dspace/bitstream/10204/2110/3/scott_1999.pdf|doi=10.1139/x99-042|url-status=live|archive-url=https://web.archive.org/web/20141205151715/http://researchspace.csir.co.za/dspace/bitstream/10204/2110/3/scott_1999.pdf|archive-date=5 December 2014}}</ref> harbour dangerous or destructive wildlife,<ref name="R Nasi, S Wunder 2002"/><ref>{{cite journal|last1=Davidson|first1=A|last2=Elliston|first2=L|last3=Kokic|first3=P|last4=Lawson|first4=K|year=2005|title=Native vegetation: cost of preservation in Australia|journal=Australian Commodities|volume=12|issue=3|pages=543–48|url=http://data.daff.gov.au/data/warehouse/pe_abare99001738/ac05_sept.pdf#page=101|url-status=live|archive-url=https://web.archive.org/web/20180201164407/http://data.daff.gov.au/data/warehouse/pe_abare99001738/ac05_sept.pdf#page=101|archive-date=1 February 2018}}</ref> and act as reservoirs of human and livestock disease.<ref>{{cite web | url = http://www.fao.org/docrep/009/a0789e/a0789e03.html | title = Forests and emerging infectious diseases of humans | first1 = B.A. | last1 = Wilcox | first2 = B. | last2 = Ellis | publisher = Food and Agriculture Organization of the United Nations | access-date = 16 November 2014 | url-status=live | archive-url = https://web.archive.org/web/20141129213641/http://www.fao.org/docrep/009/a0789e/a0789e03.html | archive-date = 29 November 2014}}</ref><ref>{{cite journal|title=Small rodents in the forest ecosystem as infectious disease reservoirs|journal=Acta Med Croatica|year=2003|volume=57|issue=5|pages=421–26|pmid=15011471|first=J|last=Margaletic|language=hr}}</ref>
An important consideration regarding carbon sequestration is that forests can turn from a carbon sink to a carbon source if plant diversity, density or forest area decreases, as as been observed in different tropical forests<ref>{{Cite journal |last=Baccini |first=A. |last2=Walker |first2=W. |last3=Carvalho |first3=L. |last4=Farina |first4=M. |last5=Sulla-Menashe |first5=D. |last6=Houghton |first6=R. A. |date=2017-10-13 |title=Tropical forests are a net carbon source based on aboveground measurements of gain and loss |url=https://www.science.org/doi/10.1126/science.aam5962 |journal=Science |language=en |volume=358 |issue=6360 |pages=230–234 |doi=10.1126/science.aam5962 |issn=0036-8075}}</ref><ref>{{Cite journal |last=Spawn |first=Seth A. |last2=Sullivan |first2=Clare C. |last3=Lark |first3=Tyler J. |last4=Gibbs |first4=Holly K. |date=2020-04-06 |title=Harmonized global maps of above and belowground biomass carbon density in the year 2010 |url=https://www.nature.com/articles/s41597-020-0444-4 |journal=Scientific Data |language=en |volume=7 |issue=1 |pages=112 |doi=10.1038/s41597-020-0444-4 |issn=2052-4463}}</ref><ref>{{Cite web |date=2017-09-28 |title=Tropical forests have flipped from sponges to sources of carbon dioxide |url=https://www.sciencenews.org/article/tropical-forests-have-flipped-sponges-sources-carbon-dioxide |access-date=2024-01-05 |language=en-US}}</ref> The typical tropical forest may become a carbon source by the 2060s.<ref>{{Cite news |last=Harvey |first=Fiona |last2=correspondent |first2=Fiona Harvey Environment |date=2020-03-04 |title=Tropical forests losing their ability to absorb carbon, study finds |url=https://www.theguardian.com/environment/2020/mar/04/tropical-forests-losing-their-ability-to-absorb-carbon-study-finds |access-date=2024-01-05 |work=The Guardian |language=en-GB |issn=0261-3077}}</ref> An assessment of European forests found early signs of carbon sink saturation, after decades of increasing strength.<ref>{{Cite journal |last=Nabuurs |first=Gert-Jan |last2=Lindner |first2=Marcus |last3=Verkerk |first3=Pieter J. |last4=Gunia |first4=Katja |last5=Deda |first5=Paola |last6=Michalak |first6=Roman |last7=Grassi |first7=Giacomo |date=September 2013 |title=First signs of carbon sink saturation in European forest biomass |url=https://www.nature.com/articles/nclimate1853 |journal=Nature Climate Change |language=en |volume=3 |issue=9 |pages=792–796 |doi=10.1038/nclimate1853 |issn=1758-6798}}</ref> The [[Intergovernmental Panel on Climate Change|Intergovernmental Panel on Climate Change (IPCC)]] concluded that a combination of measures aimed at increasing forest carbon stocks, andsustainable timber offtake will generate the largest carbon sequestration benefit.<ref>{{Citation |title=Forestry |date=2007 |url=https://www.cambridge.org/core/books/climate-change-2007-mitigation-of-climate-change/forestry/252A8A6E2DAE291C4769FD9385DA26C4 |work=Climate Change 2007 - Mitigation of Climate Change: Working Group III contribution to the Fourth Assessment Report of the IPCC |pages=541–584 |editor-last=Intergovernmental Panel on Climate Change |access-date=2024-01-05 |place=Cambridge |publisher=Cambridge University Press |isbn=978-1-107-79970-7}}</ref>
===Forest-dependent people===
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