About 41,415 species are now threatened with extinction. Monitored wild mammal populations have declined by more than half since 1990. This article presents the key statistics that define the current state of global biodiversity.
Key Takeaways
- Approximately 8 million species may exist on Earth, according to a widely cited estimate based on biodiversity modeling.
- IUCN reports 41,415 species are threatened with extinction (mammals, birds, reptiles, amphibians, etc.)—across taxonomic groups in the Red List statistics dashboard.
- Between 1990 and 2016, the global abundance of monitored wild mammal populations declined by 52% (WWF/ZSL analysis cited in Living Planet Report 2020).
- About 44% of terrestrial species monitored show declining trends (WWF/ZSL Living Planet Report synthesis).
- In 2019, 1/3 of global marine fish stocks were overfished or at biologically unsustainable levels (FAO).
- Approximately 15% of bird species are threatened with extinction (IUCN Red List summary statistics).
- Earth observation monitoring shows deforestation slowed in some years after 2015; the UN-FAO reports 10 million ha/year loss during 2015–2020 (baseline for conservation need).
- As of 2024, 20.7% of important sites for biodiversity are protected in some regions (IUCN/UNEP-WCMC reporting via Protected Planet & Key Biodiversity Areas synthesis).
- By 2021, 196 parties to CBD include 195 UN member states plus the Holy See (CBD official parties page).
- Target 18 of the Global Biodiversity Framework aims for incentives, subsidies and policies to be aligned to biodiversity outcomes, with elimination/reform of harmful incentives and increasing positive incentives by 2030 (CBD).
- The global cost of biodiversity loss and ecosystem services degradation has been estimated in the trillions of dollars annually (The Economics of Ecosystems and Biodiversity, TEEB).
- Approximately 1.2–1.4 billion people depend on forests for livelihoods, implying large economic stakes tied to biodiversity (World Bank).
- Since 1950, the Earth has warmed by about 1.0°C, affecting climate-sensitive ecosystems (IPCC AR6).
- CO2 concentration reached 419.3 ppm in 2022 (NOAA).
- Arctic sea ice extent averaged about 4.69 million square kilometers in September 2022, far below earlier decades (NOAA Arctic report).
Nature is declining fast, with millions at risk, forests and reefs shrinking, and protection still far behind.
Related reading
01 · Category
Species & Populations5 stats
01
Approximately 8 million species may exist on Earth, according to a widely cited estimate based on biodiversity modeling.
02
IUCN reports 41,415 species are threatened with extinction (mammals, birds, reptiles, amphibians, etc.)—across taxonomic groups in the Red List statistics dashboard.
03
Between 1990 and 2016, the global abundance of monitored wild mammal populations declined by 52% (WWF/ZSL analysis cited in Living Planet Report 2020).
04
The median extinction risk of birds and mammals increased in recent decades as habitat quality declined, with global biodiversity impacts reflected in IUCN assessments.
05
WWF/ZSL reported that 58% of monitored vertebrate populations declined between 1970 and 2016 (Living Planet Report 2018).
Interpretation
Species & Populations Interpretation
For the Species and Populations category, the picture is stark: IUCN lists 41,415 threatened species and monitored wild vertebrates have been shrinking, with wild mammal abundance down 52% since 1990 and 58% of monitored vertebrate populations declining from 1970 to 2016.
02 · Category
Threat Drivers7 stats
01
About 44% of terrestrial species monitored show declining trends (WWF/ZSL Living Planet Report synthesis).
02
In 2019, 1/3 of global marine fish stocks were overfished or at biologically unsustainable levels (FAO).
03
Approximately 15% of bird species are threatened with extinction (IUCN Red List summary statistics).
04
About 1.5 million km² of tropical forest were cleared between 2001 and 2019 (Global Forest Watch/peer-reviewed).
05
Biodiversity in tropical ecosystems is highly sensitive to deforestation; a large fraction of biodiversity resides in forests (peer-reviewed estimates).
06
17% of greenhouse gas emissions are linked to land-use change and forestry (IPCC).
07
The ocean acidification measured by pH has decreased by about 0.1 since the pre-industrial era (NOAA/Ocean Acidification).
Interpretation
Threat Drivers Interpretation
Across threat drivers, the combined signals are stark, with 44 percent of monitored terrestrial species declining and 1.5 million square kilometers of tropical forest cleared from 2001 to 2019, both indicating that land use change and habitat loss are pushing biodiversity toward irreversible losses.
03 · Category
Conservation Progress5 stats
01
Earth observation monitoring shows deforestation slowed in some years after 2015; the UN-FAO reports 10 million ha/year loss during 2015–2020 (baseline for conservation need).
02
As of 2024, 20.7% of important sites for biodiversity are protected in some regions (IUCN/UNEP-WCMC reporting via Protected Planet & Key Biodiversity Areas synthesis).
03
By 2021, 196 parties to CBD include 195 UN member states plus the Holy See (CBD official parties page).
04
CITES includes 5,600 species of fauna and 33,000 species of flora listed (CITES species page).
05
The IUCN Green List aims to recognize well-managed protected and conserved areas; 10,000+ sites are covered in the Green List scope over time (IUCN Green List statistics).
Interpretation
Conservation Progress Interpretation
Conservation progress is visible but uneven, with deforestation down to a still-significant 10 million hectares per year loss in 2015 to 2020, while by 2024 only 20.7% of important biodiversity sites are protected in some regions and global agreements now cover 196 CBD parties and thousands of listed species through CITES.
04 · Category
Economic Valuation7 stats
01
Target 18 of the Global Biodiversity Framework aims for incentives, subsidies and policies to be aligned to biodiversity outcomes, with elimination/reform of harmful incentives and increasing positive incentives by 2030 (CBD).
02
The global cost of biodiversity loss and ecosystem services degradation has been estimated in the trillions of dollars annually (The Economics of Ecosystems and Biodiversity, TEEB).
03
Approximately 1.2–1.4 billion people depend on forests for livelihoods, implying large economic stakes tied to biodiversity (World Bank).
04
About 75% of the world’s poor rely directly on natural resources, linking biodiversity to poverty alleviation economics (World Bank).
05
About 30% of global fish stocks are overexploited (FAO).
06
Forestry provides employment to around 13.2 million people globally (FAO).
07
The cost of invasive alien species to the global economy has been estimated at around US$423 billion annually (2019 review commonly cited; Nature/GBF sources).
Interpretation
Economic Valuation Interpretation
With the global cost of biodiversity loss and ecosystem service degradation running into the trillions of dollars each year, and invasive alien species alone estimated at about US$423 billion annually, the economic valuation case is clear that aligning incentives and reforming harmful subsidies under Target 18 is urgently needed to protect biodiversity-linked livelihoods and livelihoods that many billions depend on.
05 · Category
Global Trends10 stats
01
Since 1950, the Earth has warmed by about 1.0°C, affecting climate-sensitive ecosystems (IPCC AR6).
02
CO2 concentration reached 419.3 ppm in 2022 (NOAA).
03
Arctic sea ice extent averaged about 4.69 million square kilometers in September 2022, far below earlier decades (NOAA Arctic report).
04
Global mean sea level rose by about 0.12–0.13 meters between 1993 and 2021 (satellite record summarized by NOAA).
05
Coral reef bleaching events have increased in frequency; 2016, 2017, and 2020 involved severe bleaching globally (IPCC/WMO summaries).
06
Global forest area declined by 178 million hectares between 1990 and 2015 (FAO Global Forest Resources Assessment summary).
07
In 2022, the UNEP Emissions Gap Report assessed that current policy is insufficient to limit warming to 1.5°C (climate impacts on biodiversity).
08
Global primary energy consumption is rising; biodiversity impacts occur through land use and emissions (IEA).
09
The global methane concentration reached about 1,915 ppb in 2022 (NOAA).
10
Global N2O concentration reached about 335.1 ppb in 2022 (NOAA).
Interpretation
Global Trends Interpretation
Under the Global Trends lens, biodiversity is being pushed into decline as warming accelerates, with Earth already about 1.0°C warmer since 1950 alongside CO2 at 419.3 ppm in 2022, shrinking sea ice and raising sea levels, and even making coral bleaching far more frequent.
More related reading
06 · Category
Environmental Stressors1 stats
01
33% of assessed marine fish stocks are overexploited (i.e., at biologically unsustainable levels) — reflects pressure on aquatic biodiversity.
Interpretation
Environmental Stressors Interpretation
Under environmental stressors, 33% of assessed marine fish stocks are overexploited, showing that aquatic biodiversity is being pushed beyond biologically sustainable levels.
07 · Category
Policy & Governance2 stats
01
189 countries have ratified the Convention on International Trade in Endangered Species (CITES) — governance coverage relevant to biodiversity trade regulation.
02
197 parties have ratified the Convention on Biological Diversity (CBD) — policy participation enabling implementation of biodiversity commitments.
Interpretation
Policy & Governance Interpretation
With 197 parties to the Convention on Biological Diversity and 189 countries having ratified CITES, policy and governance are broadly in place to coordinate biodiversity commitments and regulate trade in endangered species.
08 · Category
Ecosystem & Species8 stats
01
5,000+ plant species are used in agriculture worldwide, but only 9 crops account for 66% of global crop production — indicates narrowing of crop genetic biodiversity.
02
Over 2,000 freshwater species have been reported as at risk of extinction — reflecting freshwater ecosystem biodiversity vulnerability.
03
About 76% of the world’s land is used in some way by humans — influencing habitat availability and species survival.
04
Marine heatwaves increased in frequency and intensity over recent decades — affecting marine species and ecosystems.
05
Tropical forests still cover about 40% of the world’s land area — key biodiversity reservoirs.
06
A 2020 meta-analysis finds that pollination services can be reduced by 15–30% under scenarios of land-use and habitat loss — supporting a measurable biodiversity-to-economy link.
07
Seagrass meadows are estimated to have declined by 29% worldwide since 1879 — habitat-loss magnitude affecting coastal biodiversity.
08
World wetlands have declined by 35% since 1970 — reflecting habitat loss for water-dependent species.
Interpretation
Ecosystem & Species Interpretation
Ecosystem and species biodiversity is being squeezed by habitat loss and warming, shown by wetlands shrinking 35% since 1970 and seagrass meadows declining 29% since 1879, while marine heatwaves intensify and freshwater biodiversity faces over 2,000 at-risk species.
09 · Category
Economics & Finance4 stats
01
US$44 billion of environmentally related spending is lost annually due to lack of or ineffective biodiversity policies — fiscal leakage estimate.
02
US$5.7 trillion per year in economic value is moderately or highly dependent on nature — economic reliance assessment.
03
US$124–US$242 billion per year is the estimated global funding gap for biodiversity conservation and restoration — financing shortfall range.
04
A 2018 study estimates that invasive alien species cause about US$1.4 trillion in economic damage annually worldwide — global quantification of an invasive-species impact.
Interpretation
Economics & Finance Interpretation
The economics of biodiversity shows a widening funding and policy gap, with US$124–US$242 billion per year missing for conservation and restoration while nature’s economic value of US$5.7 trillion is held back and losses like US$1.4 trillion from invasive species and US$44 billion in fiscal leakage underline how costly inaction becomes.
Reference
Cite This Report
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APA
Felix Zimmermann. (2026, February 13). Biodiversity Statistics. Gitnux. https://gitnux.org/biodiversity-statistics
MLA
Felix Zimmermann. "Biodiversity Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/biodiversity-statistics.
Chicago
Felix Zimmermann. 2026. "Biodiversity Statistics." Gitnux. https://gitnux.org/biodiversity-statistics.
Sources & references
49 datasets cited across this report · attribution is report-level
+26 additional datasets cited (not shown individually)