Less Than 10% of the World's Population, Nearly All of the Safe Operating Space

In short: There is a question that relative sustainability metrics structurally cannot answer: is this enough? A peer-reviewed study from the European Commission's Joint Research Centre answers it for an entire continent — and the number that emerges reframes what "ambitious target" means.

Better, but is it good enough?

That phrasing belongs to Michael Hauschild (2015), and the JRC team quotes it because it names the gap precisely. Life cycle assessment can quantify potential impacts and support relative comparisons in eco-efficiency terms. What it cannot do, on its own, is establish how sustainable something is beyond relative terms.

Answering that requires an absolute reference — a limit that exists independently of last year's performance or a competitor's benchmark. That is what the planetary boundaries framework, developed by Rockström et al. (2009) and updated by Steffen et al. (2015), provides: a science-based definition of the safe operating space for human development, grounded in the planet's biophysical processes.

The study by Serenella Sala, Eleonora Crenna, Michela Secchi and Esther Sanyé-Mengual (Journal of Environmental Management, 2020) is the first to comprehensively assess EU consumption against that reference.

How the assessment was built

The team assessed EU-28 production and consumption in 2010 using five different modelling perspectives, deliberately chosen to test whether conclusions hold across methods:

Domestic Footprint — statistical data on pressures and resource use within EU territory (production perspective)
Consumption Footprint bottom-up — domestic impacts plus product-based estimates of imports and exports
Consumption Footprint top-down — domestic impacts combined with multi-regional input-output estimates
Final consumption I/O Footprint — emissions allocated to economic sectors, fully top-down
Consumer Footprint — LCA of representative products across consumption areas, fully bottom-up

Results were assessed against LCIA-based planetary boundaries developed for all 16 impact categories of the EU's Environmental Footprint method. Five boundaries came directly from Bjørn and Hauschild (2015); the rest were recalculated or adapted.

Using five independent methods matters. When a finding survives every one of them, it is unlikely to be a modelling artefact.

The finding that reframes the problem

At global level, the picture is already stark. Global impacts surpass the safe operating space by sixty times for land use and eight times for both particulate matter and climate change.

Then comes the number that should reach executive committees:

The impact of EU consumption for climate change represented more than 90% of the safe operating space globally available.

The authors call this a very critical situation, with limited space left available to the rest of the world. The EU, with less than 10% of world population, was close to transgressing global ecological limits on its own.

For two categories, EU citizens had already transgressed the global boundaries outright: particulate matter (under three of the five modelling approaches) and mineral resource use.

Per capita, the transgression is systematic

Downscaling the global boundaries using an equality principle — every person holding equal rights to the environment — and comparing an average EU citizen against the per capita limits produces a consistent result across all five approaches.

The LCIA-based planetary boundaries per capita were exceeded from four times (fossil resource use, bottom-up approaches) to more than twenty times (particulate matter, top-down approaches).

The authors state it plainly: EU citizens do not appear to be living within the limits of the planet.

An average EU citizen's impacts were generally higher than an average world citizen's across most categories — with the notable exceptions of land use, freshwater eutrophication, ecotoxicity, fossil resource depletion and ozone depletion, where developing economies' patterns (deforestation, for instance) dominate.

The Factor 10 calculation

The study's most operationally useful passage converts all of this into a single, uncomfortable target.

Food represents 35% of the total carbon footprint of an average EU citizen — approximately 3.4 tonnes CO₂eq per year.

The planetary boundary for climate change, allocated per capita, is roughly one tonne CO₂eq per citizen per year (985 kg, precisely).

Distributing the reduction effort equally across consumption sectors gives food a target of 350 kg CO₂eq per citizen — a 90% reduction from current levels. A factor of ten.

The authors note this converges with the "Factor 10" concept proposed by Schmidt-Bleek, and that their calculation substantiates it quantitatively. Their conclusion about what this means is the sentence worth carrying into any strategy discussion: a target based on absolute rather than relative sustainability highlights the extent of the effort needed by production and consumption systems to remain within planetary boundaries.

Where the impact actually sits

For anyone allocating capital, the sectoral breakdown matters more than the aggregate.

Within the Consumer Footprint, food was among the predominant contributors to European impacts, alongside housing and mobility. Food consumption accounted for between 33% of total impact for climate change and 74% for eutrophication (both marine and terrestrial).

At global level, Springmann et al. (2018) found the food system to be the main driver of climate change, land use, and impacts on terrestrial and aquatic ecosystems.

The policy implication the authors draw: actions on land use, climate change and particulate matter should be prioritised, because all five indicators placed those impacts in the high-risk area.

What the EU is and isn't responsible for

The contribution of EU consumption to global impacts varies dramatically by category — from 1.3% of land use impact to 45% of ionising radiation impact.

The ionising radiation figure has a specific explanation: carbon-14 emissions, driven by nuclear power plants concentrated in Europe, which contribute close to 60% of global carbon-14 emissions according to UNSCEAR (2017).

The authors also flag a supply-chain dynamic relevant to any multinational: imports to the EU from countries with weaker environmental policies may carry higher environmental impact intensity per product. Shifting sourcing changes the footprint — sometimes in the wrong direction, invisibly.

The uncertainties the authors insist on

This is a study that argues carefully against over-reading its own results.

Uncertainty operates at three levels: the inventory (incomplete temporal or geographical data), the LCIA models themselves, and the definition of the LCIA-based boundaries.

Some categories are explicitly less robust. Under EF method recommendations, the lower-robustness categories are human toxicity (cancer and non-cancer), freshwater ecotoxicity, land use, water use and resource use.

Particulate matter shows the widest spread. Four alternative calculations of its boundary differ by up to six orders of magnitude. The authors conclude that exploring alternatives enlarged the range of results rather than suggesting a specific pathway.

The allocation principle is a normative choice. This study used equality — every person equal rights. Other ethical principles exist: sovereignty, right to development, responsibility, capacity. Ryberg et al. (2018b) found allocation method to be the main source of uncertainty in planetary-boundary LCA.

Some boundaries have no LCA equivalent at all. There is a gap between a control variable of ppm CO₂ and the 40-plus greenhouse gases in life cycle inventories. Novel entities — chemicals — have no defined boundary yet. Resource depletion sits outside the planetary boundaries framework entirely.

Frequently asked questions

What is absolute environmental sustainability? Assessing impacts against the Earth's ecological limits and carrying capacity, rather than against a baseline year, a competitor, or a unit of production. It answers whether performance is sufficient, not merely whether it improved.

How much of the global climate safe operating space does EU consumption use? More than 90%, according to the JRC study — despite the EU representing less than 10% of world population. The authors describe this as leaving limited space available to the rest of the world.

By how much does an average EU citizen exceed planetary boundaries? Between four times (fossil resource use, bottom-up modelling) and more than twenty times (particulate matter, top-down modelling), depending on the impact category and method. The transgression was significant across all five modelling approaches tested.

What is the Factor 10 target for food emissions? Food accounts for roughly 3.4 tonnes CO₂eq per EU citizen annually, or 35% of their carbon footprint. The per capita climate boundary is about 985 kg CO₂eq. An equal distribution of reduction effort implies a food target of 350 kg — a 90% cut.

Which impact categories are most critical for the EU? Land use, climate change and particulate matter — all five life-cycle indicators placed these in the high-risk area. Globally, land use exceeds its boundary by around sixty times.

Can planetary boundaries be used directly as corporate targets? Not without care. The boundaries require downscaling to smaller geographical or organisational scales, and the allocation principle chosen — equality, sovereignty, right to development — significantly changes the resulting target. Research identifies allocation as the main uncertainty source.

How do planetary boundaries relate to science-based targets? The Science Based Targets initiative applies climate science to emissions reduction goals. The authors argue the planetary boundaries framework extends that logic to further Earth processes that forthcoming environmental policy should consider.

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Source: Sala, S., Crenna, E., Secchi, M. & Sanyé-Mengual, E. (2020). "Environmental sustainability of European production and consumption assessed against planetary boundaries." Journal of Environmental Management, 269, 110686. Open access under CC BY. European Commission Joint Research Centre. Internal references: Rockström et al. (2009); Steffen et al. (2015); Bjørn & Hauschild (2015); Hauschild (2015); Häyhä et al. (2016); Ryberg et al. (2018a, 2018b); Springmann et al. (2018); Vargas-Gonzalez et al. (2019); Schmidt-Bleek (2008); UNSCEAR (2017).