Martin Quaas

• Leipzig University

Improving our understanding of future ocean carbon uptake requires a nuanced understanding of the value of the annual ocean sink. Here, we combine an abatement cost-based approach and a climate damage-based approach to assess the value of the annual ocean sink. The former shows that the aggregate cost of national climate policies could increase by...

Comparing COVID-19 response strategies across nations is a key step in preparing for future pandemics. Conventional comparisons, which rank individual non-pharmaceutical intervention (NPI) effects, are limited by: (i) a focus on epidemiological outcomes; (ii) NPIs typically being applied as packages of interventions; and (iii) different political,...

Earth is facing a rapid change in biodiversity, posing significant threats to human health and ecosystem stability. Concurrently, increased urbanization is causing humans, especially children in urban areas, to grow more disconnected from nature, resulting in a lack of perceptual and learning capabilities in nature-based domains. Early childhood ex...

Low-cost public transport tickets (LCTT) are becoming common offers to promote sustainable transportation, alleviate inflation, and improve public transport (PT) accessibility in urban areas. However, little research is available to quantify and understand the environmental and behavioral effects of the implementation of such tickets. In this compr...

Soil is central to the complex interplay among biodiversity, climate, and society. This paper examines the interconnectedness of soil biodiversity, climate change, and societal impacts, emphasizing the urgent need for integrated solutions. Human‐induced biodiversity loss and climate change intensify environmental degradation, threatening human well...

The currently dominant types of land management are threatening the multifunctionality of ecosystems, which is vital for human well-being. Here, we present a novel ecological-economic assessment of how multifunctionality of agroecosystems in Central Germany depends on land-use type and climate. Our analysis includes 14 ecosystem variables in a larg...

How can we meet economic objectives of timber harvesting while maintaining the functioning of diverse forest ecosystems? Existing forest models that address this type of question are often complex, data-intensive, challenging to couple with economic optimization models, or can not easily be generalised for uneven-aged mixed-species forests. Here, w...

Many fish consumers reveal a preference for sustainably sourced seafood in their purchasing decisions. We propose a bioeconomic mod-eling approach and an empirical strategy, based on a discrete choice experiment, to quantify the resulting effects on fishery dynamics and to derive implications for efficient fishery management. We show that a 'consum...

As people get richer, and ecosystem services scarcer, policy-relevant estimates of ecosystem value must rise

Human activities and their consequences, such as environmental pollution, the exploitation of resources or deforestation, are major causes of biodiversity loss. However, humans depend on a biologically diverse and healthy environment in many ways, as it provides access to clean water, air and food. The loss of biodiversity is an ecological crisis t...

Marine heatwaves (MHW) are globally occurring events observed with potentially long-lasting ecological effects and socio-economic repercussions. The Western Baltic Sea (WBS) is a transitional region between the North Sea and the Baltic Proper characterized by a unique physical oceanography. Warming of the area in response to climate change is signi...

Comparing COVID-19 non-pharmaceutical intervention (NPI) strategies across nations is a key step in preparing for future pandemics. Conventional comparisons, which rank individual NPI effects, are limited by: 1) vastly different political, economic, and social conditions among nations, 2) NPIs typically being applied as packages of interventions, a...

Twenty-five years since foundational publications on valuing ecosystem services for human well-being1,2, addressing the global biodiversity crisis³ still implies confronting barriers to incorporating nature’s diverse values into decision-making. These barriers include powerful interests supported by current norms and legal rules such as property ri...

The ocean carbon sink annually removes about a third of anthropogenic CO2 emissions, reducing climate change damage and CO2 abatement costs. While land sinks have been integrated into climate policies, the ocean sink has not—for good reason, since the former stores carbon within the boundaries of a given country, while the latter removes carbon fro...

Past CO2 emissions have been causing social costs and continue to reduce wealth in the future. Countries differ considerably in their amounts and time profiles of past CO2 emissions. Here we calibrate an integrated assessment model on past economic and climate development to estimate the historical time series of social costs of carbon and to asses...

Baumbach et al. 1 estimate that climate damages to the carbon storage and habitat services provided by Central American forests will cost society $51-314 billion per year through the end of the century. Their costs greatly exceed past estimates of the total value of critical biodiversity hotspots in the Amazon rainforest 2 and even the potential co...

Climate protection is a collective project. However, most previous research on people’s pro-climate behavior ignores the collective dimension, looking at personal private-sphere behavior and considering personal cost-benefit predictors only. The present paper transcends this individualistic perspective by addressing behaviors that target collective...

Reliable stock assessments are essential for successful and sustainable fisheries management. Advanced stock assessment methods are expensive, as they require age- or length-structured catch and detailed fishery-independent data, which prevents their widespread use, especially in developing regions. Furthermore, modern fisheries management increasi...

Fisheries typically consider short planning horizons that stand in contrast to long-term sustainability and biodiversity targets, especially when evolutionary time scales play a role. Many global fish stocks are exploited above sustainable levels, having caused fisheries-induced evolution towards smaller maturation sizes, lower growth rates, and lo...

The rarity of a good can increase its price. This so-called price feedback can motivate harvesters to exploit a fish stock even at low stock sizes, possibly contributing to collapse. To systematically examine the impact of price feedbacks on the bioeconomic equilibrium expected in a commercial fishery under regulated open access, we extend the stan...

The range of benefits for humans and biodiversity conservation provided by urban green spaces (UGS) receives substantial attention in relation to urban planning and management. However, little is known about the value of nature in UGS. We developed a graphical measurement scale for the naturalness of UGS, with 5 steps between largely sealed and lar...

Overfishing to feed the world's growing population is depleting fish stocks. As these species are embedded in complex food webs, single-species management plans must be replaced with models integrating multispecies fisheries, economic market feedbacks, and fisher behaviour into complex ecological interaction networks to promote sustainable resource...

Previous research has mainly considered economic factors and personal psychological factors (e.g., personal pro-environmental attitudes) as determinants of investment behavior for renewable energies. However, less is known about how social identities, i.e. the human capacity to think and act as a member of a social group, can shape green investment...

As we progress through the United Nations’ “decade of restoration”, we face the challenge of identifying and developing restoration funding mechanisms for two reasons. First, given past failures at the global level to meet restoration goals, funding mechanisms are needed that allow for scaling up restoration efforts. Second, restoration approaches...

The economics of biodiversity is gaining traction and with it the economic valuation of ecosystem services (ESS). Most current developments neglect microbial diversity, although microbial communities provide ecosystem services of great importance. Here we argue that microbial biodiversity (hereafter microbiodiversity) translates into considerable e...

Anthropogenic activity is threatening ecosystem multifunctionality, i.e. the ability of ecosystems to provide multiple functions and services which are vital for human well-being. Here we assess how multifunctionality of agroecosystems in Central Germany depends on land-use type and climate change. Our analysis included 13 ecosystem functions in a...

Anthropogenic activity is threatening ecosystem multifunctionality, i.e. the ability of ecosystems to provide multiple functions and services which are vital for human well-being. Here we assess how multifunctionality of agroecosystems in Central Germany depends on land-use type and climate change. Our analysis included 13 ecosystem functions in a...

Past CO2 emissions cause cost and reduce wealth in the future. The present value of these costs measure the wealth borrowing from the future and countries differ considerably in their share and time profile of past CO2 emissions. Here we calibrate an integrated assessment model to data on past economic and climate development to estimate the social...

The chapter assesses the role of nature's diverse values in supporting social-ecological transformations towards more just and sustainable futures. This is approached as a two-fold and mutually complementing task: a) assessing the diverse values that have been considered in developing and creating visions for, and scenarios of the future, particula...

Small-scale fisheries often operate under conditions of regulated open access; that is, the fishery is subject to natural or regulatory constraints on fishing technology, including regulations of fishing gear and fishing practices, but typically there is no direct regulation of catches. We study how an increase in harvesting efficiency changes the...

In recent years, the approach to wild-caught fisheries management has expanded beyond traditional single-fishery management. This article examines potential market failures within the fisheries sector that may arise because of a failure to account for key features of wild-caught fisheries and that can be addressed by an expanded scope. These market...

We study optimal harvesting of a renewable resource with stochastic dynamics. To focus on the effect of risk aversion, we consider a resource user who is indifferent with respect to intertemporal variability. We find that a constant escapement strategy is optimal, i.e. the stock after harvesting is constant. Under common specifications of risk aver...

Uns Autorinnen und Autoren geht es darum Wissen zu vermitteln. Wissen um Wandel, um politisches und gesellschaftliches Handeln für einen gesunden Planeten, den Erhalt und die nachhaltige Nutzung der Biodiversität zu unterstützen. Wissenschaft und Forschung zur Begleitung eines komplexen und systemaren Prozess wird angeboten. For us as contributors...

The Baltic fisheries are in distress. In the Central Baltic, fisheries management is challenged by reduced cod stock productivity, and altered species interactions. Here, we use an age-structured, ecological–economic multispecies model, which includes latest biological and economic knowledge, to advance our understanding of optimal fisheries manage...

Historical patterns of the Eastern Baltic cod stock recruitment show a shift from a regime with high reproductive potential before the early 1980s to a regime with low reproductive potential since then. This shift can be attributed to increasingly unfavorable environmental conditions for cod reproduction at that time: critical salinity and oxygen l...

Ecolabels are supposed to reduce the information asymmetry between producers and consumers, but they may also produce a warm glow of “green” behavior. We design discrete choice experiments to measure the relative importance of these motivations for choosing ecolabeled seafood products. We find that choice probability increases if the product carrie...

Carbon sequestration and storage in mangroves, salt marshes and seagrass meadows is an essential coastal ‘blue carbon’ ecosystem service for climate change mitigation. Here we offer a comprehensive, global and spatially explicit economic assessment of carbon sequestration and storage in three coastal ecosystem types at the global and national level...

Understanding tipping point dynamics in harvested ecosystems is of crucial importance for sustainable resource management because ignoring their existence imperils social-ecological systems that depend on them. Fisheries collapses provide the best known examples for realizing tipping points with catastrophic ecological, economic and social conseque...

Radiation management (RM) has been proposed as a conceivable climate engineering (CE) intervention to mitigate global warming. In this study, we used a coupled climate model (MPI-ESM) with a very idealized setup to investigate the efficacy and risks of CE at a local scale in space and time (regional radiation management, RRM) assuming that cloud mo...

This paper introduces endogenous technological change in a Hotelling-Herfindahl model of natural resource use to study the recent developments in the U.S. natural gas industry. We consider optimal forward-looking technology investments, and study implications for the order of extraction of conventional and shale gas, and a backstop technology, and...

Building on the epidemiological SIR model, we present an economic model with heterogeneous individuals deriving utility from social contacts creating infection risks. Focusing on social distancing of individuals susceptible to an infection we theoretically characterize the gap between private and social cost of contacts. Our main contribution is to...

Improving the health of coastal and open sea marine ecosystems represents a substantial challenge for sustainable marine resource management, since it requires balancing human benefits and impacts on the ocean. This challenge is often exacerbated by incomplete knowledge and lack of tools that measure ocean and coastal ecosystem health in a way that...

We study how income inequality affects the social value of a dynamic public good, such as natural capital. Our theory shows that both intra- and intertemporal inequality affect the social value of public natural capital. The direction and size of the effects are driven by the degree of substitutability between the public and private consumption goo...

We develop a bioeconomic model to analyze the long-run supply of fish and find that steady-state supply can have multiple bends in an age-structured setting. We parameterize the model using data for the Eastern stock of Atlantic Bluefin tuna during the predominantly open access period (1950 to 2006). The numerical Bluefin supply curve bends backwar...

We develop a bioeconomic model to analyze the long-run supply of fish and find that steady-state supply can have multiple bends in an age-structured setting. We parameterize the model using data for the Eastern stock of Atlantic Bluefin tuna during the predominantly open access period (1950 to 2006). The numerical Bluefin supply curve bends backwar...

Increasing attention is being given to the option of engineering the climate via Solar Radiation Management (SRM) as a potential component in future climate policies. We set up a quantitative model to analyze efficient levels of SRM deployment against the climatic and economic background conditions projected by the various Shared Socioeconomic Path...

We study how moral suasion that appeals to two major ethical theories, Consequentialism and Deontology, affects individual intentions to contribute to a public good. We use the COVID-19 pandemic as an exemplary case where there is a large gap between private and social costs and where moral suasion has been widely used as a policy instrument. Based...

We study how moral suasion that appeals to two major ethical theories, Consequentialism and Deontology, affects individual intentions to contribute to a public good. We use the COVID-19 pandemic as an exemplary case where there is a large gap between private and social costs and where moral suasion has been widely used as a policy instrument. Based...

We survey the emerging research area of sustainability economics through a quantitative full-text analysis of peer-reviewed journal publications from 1987 to 2013. To identify relevant contributions, we draw on existing definitions of sustainability economics for a keyword-based identification strategy: a combined focus on (a) the human-nature rela...

Building on the epidemiological SIR model we present an economic model with heterogeneous individuals deriving utility from social contacts creating infection risks. Focusing on social distancing of individuals susceptible to an infection we theoretically analyze the gap between private and social cost of contacts. To quantify this gap, we calibrat...

The Arctic Ocean is an early warning system for indicators and effects of climate change. We use a novel combination of experimental and time-series data on effects of ocean warming and acidification on the commercially important Northeast Arctic cod (Gadus morhua) to incorporate these physiological processes into the recruitment model of the fish...

We characterize intertemporal utility functions over heterogeneous goods that feature (i) a constant elasticity of substitution between goods at each point in time and (ii) a constant intertemporal elasticity of substitution for at least one of the goods. We find that a standard, stationary intertemporal utility function is consistent with these tw...

The wide range of benefits for humans and biodiversity conservation provided by urban green spaces (UGS) are receiving substantial attention in relation to urban planning and management. However, little is known about to which extent people value the naturalness and biodiversity of urban green spaces. We study how citizens value the naturalness of...

This paper sets up a dynamic model to study the distributive effects of privatizing an open access resource. We show that with or without discounting, privatization is not always Pareto improving. We further derive conditions under which the poor are made worse off when private use rights are equally distributed compared to a situation with open ac...

We characterize intertemporal utility functions over heterogeneous goods that feature (i) a constant elasticity of substitution between goods at each point in time and (ii) a constant intertemporal elasticity of substitution for at least one of the goods. We find that a standard (stationary) intertemporal utility function is consistent with these t...

Nature-based solutions to insurance are in high demand. We explore the idea that natural capital has an insurance value insofar as it can mitigate the effects of uncertainty on human well-being. We present a formal model that substantiates this claim. We propose a definition for the insurance value of natural capital for a stochastic and dynamic ec...

Understanding what determines the truth-telling of economic agents towards their regulator is of major economic importance from banking to the management of common-pool resources such as European fisheries. By enacting a discard-ban on unwanted fish-catches without increasing monitoring activities, the European Union (EU) depends on fishermen's tru...

Avoiding whinges from various and potentially conflicting stakeholders is a major challenge for sustainable development and for the identification of sustainability scenarios or policies for biodiversity and ecosystem services. It turns out that independently complying with whinge thresholds and constraints of these stakeholders is not sufficient b...

We study optimal subsidies for renewable energy (RE) generation to internalize external benefits from inter-temporal learning-by-doing spillovers, taking into account increasing marginal costs at the industry level due to limited availability of sites suitable for RE. We find that the optimal RE subsidy is differentiated according to productivity a...

Zusammenfassung Eine rasche Reduktion der Treibhausgasemissionen ist essentiell, wenn ambitionierter Klimaschutz erreicht werden soll. Bei der Abschätzung der dafür notwendigen Anstrengungen und der Bewertung des zukünftigen Beitrags von Technologien, die es erlauben, der Atmosphäre CO 2 zu entziehen (negative Emissionstechnologien, NETs), gehen di...

Human-induced climate change such as ocean warming and acidification, threatens marine ecosystems and associated fisheries. In the Western Baltic cod stock socio-ecological links are particularly important, with many relying on cod for their livelihoods. A series of recent experiments revealed that cod populations are negatively affected by climate...

Climate engineering (CE) deployment would alter prevailing relationships between Earth system variables, making indicators and metrics used so far in the climate change assessment context less appropriate to assess CE measures. Achieving a comprehensive CE assessment requires a systematic and transparent reevaluation of the indicator selection proc...

Arctic Ocean Acidification: update of chemical changes

Improving fisheries management is a key challenge in addressing the United Nations Sustainable Development Goal 2 (Zero Hunger) and support Goals 1 (No Poverty) and 14 (Life Below Water). However, sustaining the ocean's living resources has important dimensions beyond food security, such as cultural values, which might be of equal importance in som...

We analyze the efficiency of urbanization patterns in a stylized dynamic model of urban growth with three sectors of production. Pollution, as a force that discourages agglomeration, is caused by domestic production. We show that cities are too large and too few in number in uncoordinated equilibrium if economic growth implies increasing pollution...

The behavior of a fishing fleet and its impact onto the biomass of fish can be described by a nonlinear parabolic diffusion–reaction equation. Looking for an optimal fishing strategy leads to a non-convex optimal control problem with a bilinear control action. In this work, we present such an optimal control formulation, prove its well-posedness an...

We study under which conditions a ‘window of opportunity’ for a change from an overfishing situation, with high fishing effort, but low stocks and catches, towards sustainable fishery management arises. Studying the Eastern Baltic cod fishery we show that at very low stock sizes (as they prevailed in the early 2000s) all interest groups involved in...