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What if we let the cows in the government to let them push their cow agenda

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For industrial fishing, impliment marine protected areas and manage kep biodiversity areas to protect fish population.

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1. Wild mammal biomass has declined by 85% since the growing precense of humans

2. Transformative changes can help convserve and restore sustaniblity

3. Average abundance of native species dropped 20% since 1900 in land based habitats

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1) How can we change the current trajectories of conserving nature and sustainability?

2) What is the human carrying capacity?

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we can limit our contribution to pollution

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mitochaondria is the power house of the cell..

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mitochaondria is the power house of the cell..

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REDUCE, REUSE, RECYCLE

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As a whole, humanity overlooks the overconsumption and misuse of our fossil fuels. If us, as a society, were to be mindful and understanding of our effects on the world we live on we could take a step forward into the progress needed to save our planet.

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1. What percentage of the extinction-causing factors are caused by each class or group? (large businesses, commuters, common people, the poor)

2. How can we return life to the ocean dead zones? How risky would that be?

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1) An estimated 1 million species are threatened with extinction.

2) Since 1980 greenhouse gasses have doubled.

3) Since 1970 agricultural, fishing, and harvesting materials has increased significantly.

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What percent of tropical rainforest have we lost from 1980-2000?

Which species have been affected the most by climate change?

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1. stop climate thange

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Support groups involved with environmental restoration.

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We need to stop overfishing and using resources that we don't have. The rate at which we use land and kill animals is unsustainable and we don't have a second plan. Starting with the use of fewer fossil fuels and not killing endangered species.

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1. which geographical locations have been the most impacted?

2. what are the most important steps that we can take to reverse the damages we have caused?

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1. how bad is it in Oregon?

2. can the whole world genuinley come together for the great or good?

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1. Three-quarters of the land-based environment and about 66% of the marine environment have been significantly altered by human actions

2. 1 million animals and plants that are threatened with extinction, more than ever before in human history.

3. The poor and the Indigenous populations are affected most by climate change.

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1. Why dont we just make more animals????

2. What would happen if we cloned animals....

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1: around 1 million animal and plant species are now threatened with extinction

2: plastic pollution is ten times what it was in 1980

3: average abundance of native species in most major land-based habitats has fallen by at least 20%, mostly since 1900. More than 40% of amphibian species, almost 33% of reef-forming corals and more than a third of all marine mammals are threatened. The picture is less clear for insect species, but available evidence supports a tentative estimate of 10% being threatened. At least 680 vertebrate species had been driven to extinction since the 16th century and more than 9% of all domesticated breeds of mammals used for food and agriculture had become extinct by 2016, with at least 1,000 more breeds still threatened.

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1: Greenhouse gas emissions have doubled in 40 yrs raising global temp by 0.7 degrees celcius

2: 3/4 land-based environment and near 66% of marine environment have been impacted by seriously impacted by

3: since 1900 average abundance of native species in most major land-based habitats has fallen by at least 20%, >40% of amphibian species and almost 33% of reef-forming coral

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How can integrated management strategies be implemented to balance food and energy production with biodiversity conservation in the future?

What steps can global financial systems take to prioritize sustainability over economic growth in the coming decades?

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Around 1 million animal and plant species are now threatened with extinction.

The mass extinction is a direct result of human activity and constitutes a direct threat to human well-being in all regions of the world.

Plastic pollution has increased tenfold since 1980, 300-400 million tons of heavy metals, solvents, toxic sludge and other wastes from industrial facilities are dumped annually into the world’s waters, and fertilizers entering coastal ecosystems have produced more than 400 ocean ‘dead zones’, totalling more than 245,000 km2. (around the size of the united kingdom!!)

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1. the five things that have majorly impacted the change in nature are changes in land and sea use, direct exploitation of organisms, climate change, pollution,and invasive alien species

2. greenhouse gas emissions have doubled since 1980, causing the average global temperature to increase by at least 0.7 degrees Celsius

3. 75% of land environments and 66% of marine environments have been significantly changed by human impact

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Most of our work on Our World in Data focuses on data and research on human well-being and prosperity.

But we are just one of many species on Earth, and our demand for resources - land, water, food, and shelter - shapes the environment for other wildlife too.

For millennia, humans have been reshaping ecosystems, directly through competition and hunting of other animals, and indirectly through deforestation and land use changes for agriculture.

You can find all our data, visualizations, and writing related to biodiversity on this page. It aims to provide context on how biodiversity has changed in the past; the state of wildlife today; and how we can use this knowledge to build a future path where humans and other species can thrive on our shared planet.

Key insights on Biodiversity

On average, there has been a large decline across tens of thousands of wildlife populations since 1970

One of the most widely-quoted, but misunderstood, metrics on biodiversity is the Living Planet Index.

The Living Planet Index tries to summarize the average change in population size of tens of thousands of studied animal populations. It distills this change into a single number.

It's important to note that this data is not globally representative: some regions have much more data available than others. Biodiversity data is much more limited in the tropics, for example.

What it reports is the average decline in animal population sizes since 1970. This does not tell us the:

Number of species lost;

Number of populations or individuals that have been lost;

Number or percentage of species or populations that are declining;

Number of extinctions.

Since 1970, then, the size of animal populations for which data is available have declined by 69%, on average. The decline for some populations is much larger; for some, it's much smaller. And, in fact, many populations have been increasing in size. We cover this in the next key insight.

What you should know about this data

The Living Planet Project - which produces the Living Planet Index - is led by the Zoological Society of London (ZSL) and World Wildlife Fund (WWF).¹

Every two years, a new Living Planet Index report is published. This presents the latest high-quality data we have on animal populations, but also increases in global coverage with every new release.

The underlying data included in the Living Planet Index comes from a combination of published scientific articles, online databases, and government reports.

The Living Planet Index aggregates observations on changes in population size, and similar metrics, across tens of thousands of animal populations. Its 2022 report included figures across 30,000 wildlife populations. This captures everything from frogs to elephant species, rhinos to owls, from every continent on Earth. But even 30,000 populations are only a small fraction of the world's wildlife.

This data is not globally representative: some regions have much more data available than others. Biodiversity data is much more limited in the tropics, for example.

The Living Planet Index only includes figures on vertebrate species - mammals, birds, fish, reptiles, and amphibians. It does not include insects, corals, fungi, or plants.

Its final index is the average change in population size across all of the included animal populations. This figure is not representative of every population and is sensitive to outliers.²

Not all animal populations are in decline; around half have increasing numbers

The Living Planet Index reports that there has been a large average decline across more than 30,000 animal populations.

But, reducing the state of global biodiversity into a single figure is a problem. It hides a huge diversity of changes in animal populations within the dataset.

The Living Planet Project also shows us what percentage of studied populations have increased, decreased, and remained stable since 1970.

Almost half of these animal populations have increased. This is shown in the chart.

Understanding the broad range of changes in populations is crucial if we're to stop biodiversity loss - we need to know that not all animal populations are declining. We need to also know which populations are doing well and why they're doing well.

What you should know about this data

The Living Planet Project - which produces the Living Planet Index - is led by the Zoological Society of London (ZSL) and World Wildlife Fund (WWF).³

Every two years, a new Living Planet Index report is published. This presents the latest high-quality data we have on animal populations, but also increases in global coverage with every new release.

The underlying data included in the Living Planet Index comes from a combination of published scientific articles, online databases, and government reports.

The Living Planet Index aggregates observations on changes in population size, and similar metrics, across tens of thousands of animal populations. Its 2022 report included figures across 30,000 wildlife populations. This captures everything from frogs to elephant species, rhinos to owls, from every continent on Earth. But even 30,000 populations are only a small fraction of the world's wildlife.

This data is not globally representative: some regions have much more data available than others. Biodiversity data is much more limited in the tropics, for example.

The Living Planet Index only includes figures on vertebrate species - mammals, birds, fish, reptiles, and amphibians. It does not include insects, corals, fungi, or plants.

Its final index is the average change in population size across all of the included animal populations. This figure is not representative of every population and is sensitive to outliers.⁴

Wild mammals have declined by 85% since the rise of humans

A diverse range of mammals once roamed the planet. This changed quickly and dramatically with the rising number of humans over the course of the last 100,000 years.

Over this period, wild terrestrial mammal biomass has declined by an estimated 85%. This is shown in the chart.

This looks at the change in wild mammals on the basis of biomass. This means that each animal is measured in tonnes of carbon that it holds. This is a function of its body mass.

In an extended period between 50,000 to 10,000 years ago, hundreds of the world's largest mammals were wiped out. This is called the Quaternary megafauna extinction event.

Humans were the main driver of this, killing off species through overhunting and changes to their habitats. What's staggering is how few humans were alive at this time: fewer than 5 million people across the world.

Since then, wild mammals have continued to decline. A lot of this has been driven by the expansion of human agriculture into wild habitats.

But, the future can be very different. We have the opportunity to restore wild mammals by reducing hunting and poaching, and cutting the amount of land that we use for farming.

What you should know about this data

These estimates come from a combination of studies:

Figures 100,000 and 10,000 years ago come from the work of Anthony Barnosky.⁵

Figures for the year 1900 come from the work of Vaclav Smil.⁶

Figures for 2015 (labeled as 'Today') come from the study of biomass distribution on Earth by researchers Yinon Bar-On, Rob Phillips, and Ron Milo, published in the Proceedings of the National Academy of Sciences.⁷

Only terrestrial mammals are included in these estimates. Marine mammals, such as whales, are excluded.

These estimates compare mammals on the basis of biomass. This means that each animal is measured in tonnes of carbon that it holds. This is a function of its body mass.

To calculate the biomass of a taxonomic group, the researchers multiply the carbon stock for a single organism by the number of individuals in that group. In humans, for example, they would calculate the average carbon quantity of a person (about 15%) and multiply it by the human population.

These figures are approximate and come with significant uncertainty, for two key reasons:

The total number of wild mammals is highly uncertain. This is particularly true for wild mammal populations in the distant past.

In these calculations, researchers multiply the number of animals by the average mass of each species and assume that this mass is constant over time.

Wild mammals make up only a few percent of the world's mammals

In the chart, we see the distribution of mammals on Earth.⁸ These estimates compare mammals on the basis of biomass. This means that each animal is measured in tonnes of carbon that it holds. This is a function of its body mass. Each rectangle represents one million tonnes of carbon.

Wild mammals make up just 4% of global mammal biomass. This includes marine and land-based mammals.

The other 96% is humans and our livestock.

The dominance of humans is clear. Alone, we account for around one-third of mammal biomass. Almost ten times greater than wild mammals.

Our livestock then accounts for almost two-thirds. Cattle weigh almost ten times as much as all wild mammals combined. The biomass of all of the world's wild mammals is about the same as our sheep.

Poultry is not included here. But for birds, the distribution is similar: poultry biomass is more than twice that of wild birds.

What you should know about this data

This data comes from the study of biomass distribution on Earth by researchers Yinon Bar-On, Rob Phillips, and Ron Milo, published in the Proceedings of the National Academy of Sciences.⁹

These estimates compare mammals on the basis of biomass. This means that each animal is measured in tonnes of carbon that it holds. This is a function of its body mass.

To calculate the biomass of a taxonomic group, the researchers multiplied the carbon stock for a single organism by the number of individuals in that group. In humans, for example, they calculate the average carbon quantity of a person and multiply by the human population. If you want to quickly estimate your carbon biomass: calculate 15% of your weight.

These figures are approximate and come with significant uncertainty because the total number of wild mammals is highly uncertain.

Thanks to conservation efforts, some wild mammals are making a comeback

We have already seen that many animal populations have increased in the last decades.

Mammals in Europe are a prime example. Many of the region's iconic mammal species - such as the Eurasian beaver, European bison, and brown bear - have been making a return.

In the chart, we see the average change in the population size of several mammal species in Europe. The studied time span differs from animal to animal, as the chart shows.

For example between 1960 and 2016, populations of brown bears increased by an average of 44%. Between 1977 and 2016, populations of Eurasian otters increased by an average of 300%.

Conservation efforts have played an important role in the return of these mammals, but it is not the only reason for this positive development. One important change is that the rise in agricultural productivity made it possible that agricultural land has declined across Europe, giving more habitat back to wildlife. Countries brought in hunting quotas or even complete bans on hunting. And some species - such as the European bison - were brought back through well-managed re-introduction programs.

What you should know about this data

This data comes from the Wildlife Comeback Report 2022. This is published by a coalition of conservation organizations, including the Zoological Society of London; Birdlife International; and Rewilding Europe.¹⁰

The dataset aggregates multiple studies of animal populations for each species. For example, 98 populations are included in the final figures for Eurasian beavers.

Researchers calculate the average relative change in population size across all of the studied populations of a given species. The final figure does not tell us the total change in populations across Europe.

Not every species in Europe is increasing in numbers. The underlying report focuses on a selection of mammal species that have made a comeback in recent decades. Many of those that are not shown might still be in decline, or only have stable population numbers.

Research & Writing

More Key articles on Biodiversity

Hannah Ritchie

Living Planet Index

Mammals

Extinctions

Other articles on Biodiversity

Interactive charts on Biodiversity

Endnotes

1. WWF (2022) Living Planet Report 2022 - Building a nature-positive society. Almond, R.E.A., Grooten, M., Juffe Bignoli, D. & Petersen, T. (Eds). WWF, Gland, Switzerland.

2. Leung, B., Hargreaves, A. L., Greenberg, D. A., McGill, B., Dornelas, M., & Freeman, R. (2020). Clustered versus catastrophic global vertebrate declines. Nature, 588(7837), 267-271.

3. WWF (2022) Living Planet Report 2022 - Building a nature-positive society. Almond, R.E.A., Grooten, M., Juffe Bignoli, D. & Petersen, T. (Eds). WWF, Gland, Switzerland.

4. Leung, B., Hargreaves, A. L., Greenberg, D. A., McGill, B., Dornelas, M., & Freeman, R. (2020). Clustered versus catastrophic global vertebrate declines. Nature, 588(7837), 267-271.

5. Barnosky, A. D. (2008). Megafauna biomass tradeoff as a driver of Quaternary and future extinctions. Proceedings of the National Academy of Sciences, 105(Supplement 1), 11543-11548.

6. Smil, V. (2011). Harvesting the biosphere: What we have taken from nature. MIT Press.

7. Bar-On, Y. M., Phillips, R., & Milo, R. (2018). The biomass distribution on Earth. Proceedings of the National Academy of Sciences, 115(25), 6506-6511.

8. Bar-On, Y. M., Phillips, R., & Milo, R. (2018). The biomass distribution on Earth. Proceedings of the National Academy of Sciences, 115(25), 6506-6511.

9. Bar-On, Y. M., Phillips, R., & Milo, R. (2018). The biomass distribution on Earth. Proceedings of the National Academy of Sciences, 115(25), 6506-6511.

10. Ledger, S.E.H., Rutherford, C.A., Benham, C., Burfield, I.J., Deinet, S., Eaton, M., Freeman, R., Gray C., Herrando, S., Puleston, H., Scott-Gatty, K., Staneva, A. and McRae, L. (2022) Wildlife Comeback in Europe: Opportunities and challenges for species recovery. Final report to Rewilding Europe by the Zoological Society of London, BirdLife International and the European Bird Census Council.

Cite this work

Our articles and data visualizations rely on work from many different people and organizations. When citing this topic page, please also cite the underlying data sources. This topic page can be cited as:

Hannah Ritchie, Fiona Spooner and Max Roser (2022) - "Biodiversity". Published online at OurWorldInData.org. Retrieved from: 'https://ourworldindata.org/biodiversity' [Online Resource]

BibTeX citation

@article{owidbiodiversity, author = {Hannah Ritchie and Fiona Spooner and Max Roser}, title = {Biodiversity}, journal = {Our World in Data}, year = {2022}, note = {https://ourworldindata.org/biodiversity} }

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Explore the diversity of wildlife across the planet. What are species threatened with? What can we do to prevent biodiversity loss?

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United Nations Biodiversity Report (2019)

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United Nations Biodiversity Report (2019)

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