How much land would a plant-based world free?

Roughly 3 billion hectares, about 76% of current farmland, according to the Poore & Nemecek analysis.

Is cattle ranching really behind Amazon loss?

Yes — monitoring by INPE and independent analyses attribute the large majority of clearance to pasture, with feed cropland following.

Would rewilding actually store carbon?

Yes. Restored forests and grasslands accumulate carbon for decades; the potential is measured in hundreds of gigatonnes CO₂.

What about regenerative grazing?

Soil-carbon gains are real but modest, saturate within decades, and are generally outweighed by methane and land requirements.

Does eating less dairy help land use?

Substantially — dairy requires roughly fourteen times the land of peas per unit of protein.

All guidesEnvironment9 min read

Land, forests and biodiversity: agriculture's biggest bill

Livestock uses 77% of farmland and returns 18% of calories. That ratio is why land use — not emissions alone — is the sharpest environmental argument.

In short

Half of habitable land is agricultural; livestock and their feed occupy 77% of it.
Agriculture is the primary driver of deforestation, and cattle ranching drives most Amazon clearance.
Wild mammal biomass has fallen while livestock now outweigh wild mammals many times over.
A global plant-based shift could free roughly 3 billion hectares — the largest available carbon-removal opportunity.

Key numbers

77%

Of farmland used for livestock and feed

Our World in Data / FAO

18%

Of global calories from those animals

FAO

~80%

Of Amazon deforestation linked to cattle

Yale E360 / INPE

3 bn ha

Farmland freed under a global plant-based diet

Science 2018

The efficiency loss is thermodynamic

Feeding crops to animals discards most of the energy as heat, movement and inedible tissue. Conversion efficiencies run from roughly 3% for beef to about 20% for chicken and milk. Any system built on that ratio needs more land than one that eats the crops directly.

Deforestation follows demand, not borders

Soy is often blamed for forest loss, and correctly — but around three-quarters of global soy is crushed into animal feed. Beef and feed-soy together dominate tropical clearance, which is why import bans and certification schemes struggle: the demand signal simply relocates.

One football pitch of rainforest is cleared roughly every six seconds.
Cleared land releases stored carbon immediately and loses its future sequestration capacity.
Fires used for clearance drive regional health impacts far from the farm.

Biodiversity: habitat conversion is the main mechanism

IPBES identifies land-use change as the leading driver of terrestrial biodiversity loss, ahead of climate change. Agriculture is the dominant form of that change. Livestock also outcompete wildlife for water and forage and drive predator culling programmes across continents.

Rewilding freed land is the missed lever

Carbon opportunity cost accounting shows that restoring vegetation on land currently used for animal agriculture could sequester several hundred gigatonnes of CO₂ over decades — comparable to a decade or more of global emissions, and achievable without new technology.

The data

Mammal biomass on Earth, share of total

Livestock62 %
Humans34 %
Wild mammals4 % · remaining

At a glance

Land required to produce 100 g of protein

Food	Land m²	Relative to peas	Main pressure
Beef (beef herd)	164	55×	Deforestation, methane
Lamb	185	62×	Overgrazing
Cheese	41	14×	Feed cropland
Pork	11	4×	Feed soy
Poultry	7	2×	Feed soy
Tofu	2.2	0.7×	Low
Peas	3.4	1×	Low

Common objections

ClaimSoy farming is caused by vegans.

What the evidence showsAround three-quarters of global soy is fed to farmed animals; direct human soy foods are a small minority of production.

ClaimGrazing land could not grow crops anyway.

What the evidence showsSome could not — but marginal land can be restored to forest or grassland, which is a climate benefit rather than a waste.

ClaimBiodiversity loss is mostly about climate change.

What the evidence showsIPBES ranks land-use change first, and agriculture is its principal driver.

Questions people ask

How much land would a plant-based world free?: Roughly 3 billion hectares, about 76% of current farmland, according to the Poore & Nemecek analysis.
Is cattle ranching really behind Amazon loss?: Yes — monitoring by INPE and independent analyses attribute the large majority of clearance to pasture, with feed cropland following.
Would rewilding actually store carbon?: Yes. Restored forests and grasslands accumulate carbon for decades; the potential is measured in hundreds of gigatonnes CO₂.
What about regenerative grazing?: Soil-carbon gains are real but modest, saturate within decades, and are generally outweighed by methane and land requirements.
Does eating less dairy help land use?: Substantially — dairy requires roughly fourteen times the land of peas per unit of protein.

Sources

Figures are drawn from the sources listed at the end of this guide.

Text on this page is free to reuse under CC BY 4.0 with attribution to Veg.ac.

Keep reading

Climate scienceThe climate footprint of food, measured properlyRead the guide EnvironmentWater, pollution and food: from aquifers to dead zonesRead the guide Ethics & scienceAnimal sentience: what science established, and what law now recognisesRead the guide

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