Ecological change affects living systems across land and sea, linking habitat loss, warming, pollution, and overexploitation to real pressures on wildlife. You’ll track signals across species declines, biodiversity hotspots, marine impacts, and climate-sensitive regions like the Arctic. Then explore how tools such as protected areas, restoration, and ecosystem-based policies can help ecosystems recover.
Key Takeaways
- The IUCN Red List assesses 150,349 species, of which 42,089 (28%) are classified as threatened with extinction as of 2023
- Global biodiversity has declined by an average of 69% in populations of mammals, fish, birds, reptiles, and amphibians since 1970 according to the WWF Living Planet Report 2022
- Over 1 million animal and plant species are now threatened with extinction, many within decades, as reported by the IPBES Global Assessment Report 2019
- Global average temperature has risen by 1.1°C since pre-industrial times, IPCC AR6 2021
- 2023 was the hottest year on record, 1.48°C above pre-industrial levels, Copernicus Climate Change Service 2024
- Sea levels have risen by 20 cm since 1900, with rate accelerating to 4.62 mm/year (2013-2022), NOAA 2023
- Protected areas cover 17% land, 8% ocean, preventing significant habitat loss, UNEP-WCMC 2023
- Global reforestation efforts planted 13.6 billion trees since 2016 via Trillion Trees initiative, but survival rates ~50%, Nature 2022
- IUCN SSC saved 48 species from extinction since 1993, including 25 birds, IUCN 2023
- Global deforestation rate: 10 million hectares/year (2015-2020), equivalent to 27 football fields/minute, FAO 2020
- Amazon rainforest lost 11.6% of its area (76 Mha) since 1985, INPE 2023
- Indonesia lost 9.7 Mha primary forest (2002-2019), world's highest, Global Forest Watch 2020
- Plastic pollution: 14 million tonnes enter oceans annually, IUCN 2021
- Microplastics found in 88% of ocean surface waters globally, representing 1.1 trillion pieces >0.5mm, Science 2020
- Global plastic production reached 460 million tonnes in 2019, projected 25% increase by 2025, OECD 2022
Biodiversity and habitats are collapsing fast while warming and pollution accelerate, despite some conservation efforts.
Related reading
01 · Category
Biodiversity30 stats
01
The IUCN Red List assesses 150,349 species, of which 42,089 (28%) are classified as threatened with extinction as of 2023
02
Global biodiversity has declined by an average of 69% in populations of mammals, fish, birds, reptiles, and amphibians since 1970 according to the WWF Living Planet Report 2022
03
Over 1 million animal and plant species are now threatened with extinction, many within decades, as reported by the IPBES Global Assessment Report 2019
04
Insect populations in German protected areas have declined by 76% over 27 years (1989-2016), with biomass loss of 82%, per a 2017 study in PLOS One
05
Coral reefs have lost approximately 14% of their cover globally since 2009, equating to 11,700 square kilometers, according to the Global Coral Reef Monitoring Network 2020
06
85% of wetland areas have been lost since 1700, totaling 3.4 million square kilometers, as per the Ramsar Convention's Global Wetland Outlook 2018
07
Bird populations in North America have declined by 3 billion (29%) since 1970, per Science Advances 2019 study
08
Freshwater species populations have declined by 84% on average since 1970, the highest of any ecosystem, WWF Living Planet Report 2022
09
37% of assessed shark and ray species (123 out of 331) are threatened with extinction, IUCN 2020
10
Global tree cover loss from 2001-2022 totaled 502 Mha (million hectares), equivalent to the size of South America, Global Forest Watch
11
75% of Earth's land surface (excluding Antarctica) has been significantly altered by human actions, IPBES 2019
12
Marine animal populations have declined by 34% since 1970, WWF 2022
13
1 in 4 mammals is threatened with extinction globally, IUCN 2022
14
Amphibian populations have declined by 68% since 1970, WWF 2022
15
40% of global insect species are at risk of extinction, per 2019 review in Biological Conservation
16
Seagrass meadows have declined by 7% per year in some regions since the 1980s, UNEP 2021
17
51% of assessed freshwater fish species are threatened, IUCN 2023
18
Global mangrove extent has declined by 35% since 1980, totaling 1.3 million hectares lost, FAO 2007 updated in 2020
19
Reptile species threatened: 21% of 10,196 assessed (2,177 species), IUCN 2022
20
97% of insect-driven pollination is provided by wild bees, and 1/3 of wild bee species are declining, IPBES 2016
21
Ocean biodiversity hotspots have lost 30-50% of species in recent decades, per Nature 2021
22
60% of 680 assessed medicinal plant species are threatened, WHO/IUCN 2017
23
Bat populations in North America declined by 75% in affected caves due to white-nose syndrome since 2006, USGS 2022
24
80% of wild coffee species are at risk of extinction by 2100 due to climate change, Kew Gardens 2019
25
Global population of African elephants declined from 12 million a century ago to 415,000 in 2015, WWF
26
25% of assessed conifer species (48 of 193) are threatened, IUCN 2021
27
Kelp forests have declined by 40-60% in some regions since 1950, Oceanography 2020
28
35% of assessed cycad species (199 of 354) are critically endangered, IUCN 2022
29
Global freshwater megafauna populations declined by 88% from 1970-2020, Fish and Fisheries 2023
30
50% of primate species (over 300) are threatened with extinction, IUCN 2020
Interpretation
Biodiversity Interpretation
Biodiversity is in steep decline, with 28% of the 150,349 species assessed by the IUCN Red List already classified as threatened and global populations of mammals, fish, birds, reptiles, and amphibians down an average of 69% since 1970, showing that loss of life on Earth is both widespread and accelerating.
02 · Category
Climate Change26 stats
01
Global average temperature has risen by 1.1°C since pre-industrial times, IPCC AR6 2021
02
2023 was the hottest year on record, 1.48°C above pre-industrial levels, Copernicus Climate Change Service 2024
03
Sea levels have risen by 20 cm since 1900, with rate accelerating to 4.62 mm/year (2013-2022), NOAA 2023
04
Arctic sea ice extent has declined by 12.6% per decade since 1979, NSIDC 2023
05
Ocean heat content has increased by 436 zettajoules (0-2000m depth) from 1971-2022, equivalent to 91 billion Hiroshima bombs, IPCC AR6
06
CO2 atmospheric concentration reached 419 ppm in 2023, highest in 2 million years, NOAA Mauna Loa
07
Global glacier mass loss: 267 Gt/year (2011-2020), highest on record, IPCC AR6
08
Extreme heat days have increased 5-fold globally since 1950s, World Weather Attribution 2023
09
Methane levels rose 11% from 2008-2019, contributing 30% to warming since 1990, NOAA 2022
10
Coral bleaching events have doubled in frequency since 1980s, NOAA Coral Reef Watch 2023
11
Global wildfire carbon emissions tripled from 2001-2023, Copernicus 2024
12
Antarctic sea ice hit record low in Feb 2023, 1.79 million km², 30% below average, NSIDC
13
Crop yield losses due to climate: 21% for wheat, 5% for maize globally (1981-2019), Nature Climate Change 2021
14
Human deaths from extreme weather: 5 million annually attributable to climate change (1991-2018), Nature Climate Change 2021
15
Tropical cyclones intensified by 10% per decade since 1979, Geophysical Research Letters 2020
16
Permafrost thaw released 1.7 Gt carbon annually (2000-2017), Nature Geoscience 2021
17
Ocean acidification increased 30% since industrial revolution, pH drop 0.1 units, IOC-UNESCO 2022
18
Global precipitation extremes: 7% increase per 1°C warming, IPCC AR6
19
Heatwaves 5 times more likely due to climate change in 2023, World Weather Attribution
20
Greenland ice sheet lost 280 Gt/year (1992-2018), Nature 2020
21
Drought frequency doubled in Mediterranean since 1900, IPCC AR6
22
Vector-borne diseases expanding: malaria risk to 5.2 billion people by 2080, Lancet 2022
23
Renewable energy share in electricity: 29% global in 2022, IRENA
24
Fossil fuel CO2 emissions peaked? No, rebounded to 37.4 Gt in 2023, Global Carbon Project
25
1.5°C warming threshold could be reached by 2030s under current policies, UNEP Emissions Gap 2023
26
Global surface air temperature anomaly +1.18°C (2014-2023 decade), warmest on record, WMO 2024
Interpretation
Climate Change Interpretation
The Climate Change data show an unmistakable warming trend as global average temperatures rise 1.1°C since pre-industrial times and 2023 hit the hottest year on record at 1.48°C above those levels, while rising seas and shrinking Arctic sea ice confirm the impacts are accelerating.
03 · Category
Conservation21 stats
01
Protected areas cover 17% land, 8% ocean, preventing significant habitat loss, UNEP-WCMC 2023
02
Global reforestation efforts planted 13.6 billion trees since 2016 via Trillion Trees initiative, but survival rates ~50%, Nature 2022
03
IUCN SSC saved 48 species from extinction since 1993, including 25 birds, IUCN 2023
04
Payments for ecosystem services cover 400 Mha, mostly forests, PESP 2021
05
Global wildlife trade regulated by CITES for 40,000 species, preventing overexploitation, CITES 2023
06
Community-managed forests store 31% more carbon than state-managed, PNAS 2020
07
Marine Protected Areas (MPAs) increased to 8.4% ocean coverage (26 M km²) by 2023, but only 2.6% no-take, MPAtlas 2024
08
Reforestation/restoration potential: 900 Mha globally, sequester 205 Gt CO2, Science 2019
09
Endangered species recovery: 4% of US listed species delisted due to recovery (1991-2020), USFWS 2023
10
Indigenous territories protect 36 Mha Amazon forest, reducing deforestation 50% vs non-indigenous, PNAS 2021
11
Global biodiversity credits emerging, 100+ projects offsetting 1 Mt CO2e via habitat, Verra 2023
12
Rewilding Europe restored 3 Mha, reintroduced 130 species, Rewilding Europe 2023
13
Coral reef restoration: 100,000+ corals outplanted globally, but survival 20-50%, Frontiers 2022
14
Sustainable fishing certifications (MSC) cover 14% global catch, 20,000+ products, MSC 2023
15
BirdLife International's Key Biodiversity Areas cover 13% land, protecting 86% threatened birds, BirdLife 2023
16
Global peatland restoration: 500,000 ha rewetted 2016-2023, UNECE 2024
17
Invasive species management eradicated 1,000+ populations from islands, Island Conservation 2023
18
Green bonds for conservation: $50 billion issued 2015-2022, Climate Bonds Initiative
19
Butterfly recovery: 50% populations stabilized in UK via agri-environment schemes, Butterfly Conservation 2022
20
Ocean cleanup removed 100,000 kg plastic from Great Pacific Garbage Patch since 2019, The Ocean Cleanup 2023
21
Half-Earth Project aims 50% land protected by 2050, currently 15%, E.O. Wilson Biodiversity Foundation 2023
Interpretation
Conservation Interpretation
Conservation is making measurable progress as protected areas now cover 17% of land and 8% of ocean while community-managed forests store 31% more carbon than state-managed lands and initiatives have helped save 48 species from extinction since 1993.
More related reading
04 · Category
Deforestation21 stats
01
Global deforestation rate: 10 million hectares/year (2015-2020), equivalent to 27 football fields/minute, FAO 2020
02
Amazon rainforest lost 11.6% of its area (76 Mha) since 1985, INPE 2023
03
Indonesia lost 9.7 Mha primary forest (2002-2019), world's highest, Global Forest Watch 2020
04
Tropical primary forest loss: 4.1 Mha in 2022, highest since 2010, WRI 2023
05
Congo Basin deforestation: 5.1 Mha lost 2001-2022, accelerating recently, Global Forest Watch
06
Global tree cover loss 2022: 6.6 Mha from fires, 4.1 Mha commodity-driven, WRI
07
Soy expansion drove 2.4 Mha deforestation in Brazil 2001-2020, WWF 2022
08
Palm oil plantations caused 3.5 Mha deforestation in Indonesia 2000-2016, Chain Reaction Research 2020
09
Cattle ranching responsible for 80% of Amazon deforestation, WWF 2021
10
Illegal logging accounts for 15-30% of global wood trade, 50-90% in Amazon, WWF 2023
11
Boreal forest loss: 2.3 Mha/year Canada/Russia 2001-2019 from fire/logging, Global Forest Watch
12
Mangrove deforestation rate 0.13%/year (2010-2020), 35,000 ha/year lost, UNEP-WCMC 2022
13
Africa lost 3.9 Mha primary forest 2010-2020, FAO
14
Mining drove 0.5 Mha tropical deforestation 2005-2013, Nature Geoscience 2017
15
Urban expansion caused 1.2 Mha forest loss globally 2000-2020, The Lancet Planetary Health 2022
16
Fire-related tree cover loss 2023: 7.3 Mha globally, highest except 2020, Global Forest Watch
17
Brazil Cerrado lost 23% cover since 1985, 50 Mha, MapBiomas 2023
18
Timber plantations expanded 5 Mha 2010-2020, often replacing native forest, FAO
19
Southeast Asia lost 30% peatland forest 1990-2015, 6.5 Mha drained, Wetlands International 2020
20
Global net forest loss slowed to 5.2 Mha/year 2010-2020 from 7.8 Mha 1990-2000, FAO 2020
21
Protected areas prevented 29.1 Mha deforestation 2010-2015 globally, Nature 2019
Interpretation
Deforestation Interpretation
Deforestation is accelerating worldwide, with global tree cover loss in 2022 reaching 6.6 million hectares from fires and 4.1 million hectares driven by commodities, while major forests such as the Amazon have already lost 76 million hectares since 1985.
05 · Category
Pollution22 stats
01
Plastic pollution: 14 million tonnes enter oceans annually, IUCN 2021
02
Microplastics found in 88% of ocean surface waters globally, representing 1.1 trillion pieces >0.5mm, Science 2020
03
Global plastic production reached 460 million tonnes in 2019, projected 25% increase by 2025, OECD 2022
04
80% of marine litter is plastic, totaling 11 million tonnes/year into oceans, UNEP 2021
05
Air pollution causes 7 million premature deaths annually, WHO 2022
06
Nitrogen pollution from agriculture affects 66% of European freshwater bodies, EEA 2023
07
Global e-waste generated 62 million tonnes in 2022, only 22.3% recycled, UNU 2024
08
PFAS 'forever chemicals' detected in rainwater worldwide exceeding safe levels, PNAS 2022
09
Lead exposure causes 1.2 million deaths/year globally, mostly children, Lancet 2022
10
Oil spills release 3-8 million tonnes into oceans annually from chronic sources, ITOPF 2023
11
Atmospheric ammonia pollution tripled since 1960, causing 1.5 million premature deaths/year, Nature 2023
12
91% of world population breathes unsafe air, PM2.5 levels 5x WHO guideline, IQAir 2023
13
Pesticide use: 3.5 million tonnes/year globally, contaminating 24% of arable land, FAO 2022
14
Mercury emissions from artisanal gold mining: 1,000 tonnes/year, UNEP 2023
15
Textile microfibers: 0.5 million tonnes/year into oceans from laundry, IUCN 2017
16
Coal power plants emit 10 Gt CO2/year, plus SO2 40 Mt, air pollution hotspots, Global Energy Monitor 2023
17
Groundwater nitrate pollution affects 185 million people, exceeding safe limits, The Lancet 2020
18
Ship scrubber washwater discharges 10-20 million tonnes acidic waste into seas annually, Nature Sustainability 2022
19
Global fertilizer nitrogen use: 110 Mt/year, 50% lost to environment, Our World in Data 2023
20
PCB levels in Arctic beluga whales 10x higher than 1970s despite bans, Science 2021
21
Urban noise pollution exceeds WHO limits in 80% of European cities, EEA 2020
22
Light pollution increased 10% annually, affecting 80% of world population, Science Advances 2022
Interpretation
Pollution Interpretation
Pollution is escalating fast across media and scales, with 14 million tonnes of plastic entering the oceans every year and microplastics already detected in 88% of surface waters, alongside 7 million premature deaths from air pollution annually.
Reference
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APA
Min-ji Park. (2026, February 13). Ecological Statistics. Gitnux. https://gitnux.org/ecological-statistics
MLA
Min-ji Park. "Ecological Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/ecological-statistics.
Chicago
Min-ji Park. 2026. "Ecological Statistics." Gitnux. https://gitnux.org/ecological-statistics.
Sources & references
64 datasets cited across this report · attribution is report-level