The world's top 10% spenders are responsible for environmental damage worth between $1.7 and $5.7 trillion

This study is novel within the literature on the environmental footprint of consumption because it monetizes the global impacts per decile of spending derived from a previous study. That study calculated carbon (CO₂), phosphorus (P), nitrogen (N), freshwater consumption, and biodiversity loss footprints associated with final household consumption, including energy, goods, and services. To translate these footprints from physical units to monetary values, the authors use values ​​from the 2024 Environmental Pricing Manual, which involves certain assumptions to harmonize impact units or to scale the value of impacts according to GDP per capita. This allows them to calculate the total environmental damage cost of per capita consumption by the world's wealthiest 10% (between $2,300 and $7,500 per year), with the highest cost for consumers in the United States (between $19,000 and $63,000) and the lowest for the wealthiest consumers in India (between $410 and $1,400). The study concludes that this amount would more than cover the funding needed to achieve, as a whole, the global biodiversity conservation goals for 2030 and the climate change mitigation goals.

In this respect, the study is important because it contributes to the increasingly prominent and relevant debate on the inequality or fairness of global mitigation and sustainability goals, providing evidence that consumers in wealthier countries cause greater environmental degradation on a global scale, implying that they bear greater responsibility for exceeding planetary boundaries, with climate change and biodiversity loss being the most significant aspects.

By quantifying these impacts, the study also highlights the economic harm caused by environmental degradation and suggests that this should be compensated in some way, given that the costs of environmental damage are higher in countries with a higher GDP per capita. This also contributes to the debate on insufficient international funding for addressing environmental issues, since it is often the countries with lower GDP per capita but greater natural capital that must shoulder the greatest environmental conservation and protection efforts.

Regarding limitations, for example, it should be noted that the estimated cost of environmental damage is based on final consumption, while higher-income individuals also accumulate more savings and investments, which, if taken into account, would further widen the gap between countries and their perceived responsibility for financing environmental initiatives.

Another limitation stems from the assumptions used to quantify biodiversity loss per unit of Potentially Disappeared Fraction of Species (PDF). Among other things, this fraction was calculated without considering the affected biomes in each country (a crucial factor in responding to species loss), while monetization was calculated based on prices per PDF in Europe, which is not representative of the rest of the world. Furthermore, the study only provides values ​​for 2017, whereas it would have been valuable to examine the evolution of damage and costs to assess the potential impact (or lack thereof) of more stringent climate targets.

The article is of good quality and addresses a very interesting and urgent topic of current debate. The work is supported by prestigious authors from renowned institutions such as the University of Oxford.

It aligns with recent evidence on i) the vast global inequalities in emissions and environmental damage, as well as ii) the unequal impacts of climate change. Therefore, the novelty of the article lies not so much in highlighting the inequalities as in estimating the costs.

[Regarding potential limitations] The article makes estimates, and these should therefore be interpreted with caution. All monetary estimates are subject to error.

The article is the result of groundbreaking research. It is of high quality. It addresses a fundamental issue: the attribution of responsibility for the causes of current climate change and biodiversity loss across the planet. And, as its main finding indicates, the wealthiest 10% of consumers in the countries with the highest greenhouse gas emissions are responsible for nearly half of the damage caused by climate change.

The article confirms the emergence of an increasingly unequal world, in which the wealthy are primarily responsible for the impact of current climate change and the loss of biodiversity occurring across the planet. Conversely, the effects of climate change are more evident and severe in less developed societies, which cannot cope with this damage on their own. This is yet another example of what is known as the “secession of the rich” in today’s world: a wealthy population that is growing ever richer and faces no limits on its consumption, contrasted with an ever-increasing percentage of the poor population that suffers the consequences of the actions of the former.

That top 10% of the population would include the major fortunes and the companies they represent in Spain. Although globally, this is a very small share compared to countries like the U.S., China, or India.

[Regarding possible limitations] The study highlights the need for the wealthiest to contribute more and provide more funding for climate change mitigation efforts. It also proposes the “polluter pays” principle. However, this principle has proven ineffective in reducing environmental impact in the countries where it has been applied, because those with money end up paying so they can continue polluting. There are tax formulas that may prove more effective, such as taxes based on revenue (for companies) or net worth (for individuals).

Tax revenue must always serve a specific purpose. That is, the money must be used for climate change mitigation measures, and a transparent annual report on this process must be published. Furthermore, the money collected from the wealthiest segment of the population should not be directed solely toward mitigation but, above all, toward helping regions and societies adapt to the impacts of climate change—an issue that cannot be resolved in the short or medium term.

The study involves researchers from Leiden University and the Oxford Martin School at the University of Oxford, and is published in Communications Sustainability, a peer-reviewed journal of the Nature group. The data are publicly available for independent verification, and the methodology is sound. This article offers a useful insight into the imbalance in environmental responsibility; however, it remains at the level where problems are identified, without reaching the level where they are resolved. From a land-use planning perspective, experience shows that global environmental policies only have a real impact when they translate into concrete solutions: which species to protect and where, which watershed requires which adaptation measure, and which rural community can lead which transition. Without such implementation, the trillions of dollars in “environmental costs” calculated by the study are figures without practical consequences.

Finding solutions—even interim ones—requires simultaneously considering three elements. The first is regulatory frameworks with real physical limits, not just economic ones: there are forms of ecosystem damage that cannot be compensated for with money and that must be prohibited regardless of the polluter’s ability to pay. The second is end-to-end accountability, because consumer countries can no longer be allowed to export their environmental impact to producer countries while maintaining a “clean” footprint. The third is sustained investment in local governance: the territories that are home to the biodiversity and ecosystem services we wish to conserve need to strengthen their technical capacity, their resources, and their meaningful participation in decision-making—not merely be recipients of policies designed far removed from their reality.

The “polluter pays” principle is necessary, but experience has shown that it is not sufficient. The study also uses monetary expenditure as an indicator of environmental damage, which excludes patterns of mass, low-cost consumption whose actual footprint may be equally or more destructive. High expenditure does not necessarily equate to greater damage, nor does low expenditure equate to environmental innocence. What is needed is for those who conserve to be compensated as well; for rural communities that maintain functional ecosystems to receive the economic and institutional recognition currently denied to them; and for land-use planning based on scientific evidence to serve as a bridge between global agreements and the decisions made at the level of a watershed, an ecological corridor, or a municipality of one hundred residents.