Rewilding and opportunity cost

What opportunity cost measures

An opportunity-cost analysis asks what could be produced, conserved, or restored if the same land were used differently. In a U.S. cropland model, nutritionally comparable plant replacements produced approximately 20 times as much food per unit of cropland as beef and twice as much as eggs; replacing all modelled animal-source items increased the calculated food supply by enough to feed 350 million additional people (Shepon et al., 2018). These are modelled substitutions constrained by protein, calories, and selected nutrients, not observations of an economy-wide dietary transition (Shepon et al., 2018).

A global life-cycle synthesis covering 38,700 farms found wide variation among producers, but also reported that the lowest-impact animal products typically exceeded the impacts of vegetable substitutes (Poore & Nemecek, 2018). This supports the stub's claim that land-sparing is a strong empirical consideration for plant-forward diets while also showing that production method and place remain relevant (Poore & Nemecek, 2018).

From spared land to restoration

Land no longer required for pasture or feed crops creates a biophysical opportunity; it does not specify what happens next. Hayek and colleagues modelled shifts in global food production toward plant-based diets by 2050 and estimated potential sequestration of 332–547 GtCO2 if native vegetation recovered on the affected land (Hayek et al., 2020). The estimate therefore combines two conditions: a change in agricultural demand and successful ecosystem restoration (Hayek et al., 2020). It should not be read as carbon removal that follows automatically from a dietary change.

Restoration outcomes also depend on where action occurs. A global optimization study found large spatial differences in restoration benefits and costs; prioritizing locations for biodiversity, climate mitigation, and cost substantially increased estimated benefits compared with restoration allocated without those priorities (Strassburg et al., 2020). The relevant land may be suitable for natural regeneration, active restoration, continued low-intensity production, renewable energy, housing, or other uses, and those alternatives are not resolved by land-footprint calculations alone (Strassburg et al., 2020).

Implementation conditions

Research on nature-based climate solutions identifies safeguards that affect whether restoration produces durable ecological and social benefits. These include protecting existing ecosystems, avoiding replacement of native ecosystems with inappropriate tree plantations, and respecting local resource rights (Seddon et al., 2021). Consequently, incentives, tenure, land-use planning, restoration finance, and monitoring are material parts of converting lower agricultural demand into rewilding or carbon sequestration (Seddon et al., 2021; Strassburg et al., 2020).

The literature therefore distinguishes potential from delivery. Diet and production scenarios can quantify large land and carbon opportunities, but realized outcomes depend on economic responses and deliberate land policy (Hayek et al., 2020; Seddon et al., 2021).