TY - JOUR A1 - Sureth, Michael A1 - Kalkuhl, Matthias A1 - Edenhofer, Ottmar A1 - Rockström, Johan T1 - A welfare economic approach to planetary boundaries JF - Jahrbücher für Nationalökonomie und Statistik N2 - The crises of both the climate and the biosphere are manifestations of the imbalance between human extractive, and polluting activities and the Earth’s regenerative capacity. Planetary boundaries define limits for biophysical systems and processes that regulate the stability and life support capacity of the Earth system, and thereby also define a safe operating space for humanity on Earth. Budgets associated to planetary boundaries can be understood as global commons: common pool resources that can be utilized within finite limits. Despite the analytical interpretation of planetary boundaries as global commons, the planetary boundaries framework is missing a thorough integration into economic theory. We aim to bridge the gap between welfare economic theory and planetary boundaries as derived in the natural sciences by presenting a unified theory of cost-benefit and cost-effectiveness analysis. Our pragmatic approach aims to overcome shortcomings of the practical applications of CEA and CBA to environmental problems of a planetary scale. To do so, we develop a model framework and explore decision paradigms that give guidance to setting limits on human activities. This conceptual framework is then applied to planetary boundaries. We conclude by using the realized insights to derive a research agenda that builds on the understanding of planetary boundaries as global commons. KW - cost-benefit analysis KW - cost-effectiveness analysis KW - global commons KW - planetary boundaries KW - precautionary principle KW - shadow price KW - uncertainty KW - welfare economics Y1 - 2023 U6 - https://doi.org/10.1515/jbnst-2022-0022 SN - 0021-4027 SN - 2366-049X VL - 243 IS - 5 SP - 477 EP - 542 PB - De Gruyter Oldenbourg CY - Berlin ER - TY - JOUR A1 - Kalkuhl, Matthias A1 - Steckel, Jan Christoph A1 - Edenhofer, Ottmar T1 - All or nothing BT - climate policy when assets can become stranded JF - Journal of environmental economics and management N2 - This paper develops a new perspective on stranded assets in climate policy using a partial equilibrium model of the energy sector. Political-economy related aspects are considered in the government's objective function. Lobbying power of firms or fiscal considerations by the government lead to time inconsistency: The government will deviate from a previously announced carbon tax which creates stranded assets. Under rational expectations, we show that a time-consistent policy outcome exists with either a zero carbon tax or a prohibitive carbon tax that leads to zero fossil investments - an "all-or-nothing" policy. Although stranded assets are crucial to such a bipolar outcome, they disappear again under time-consistent policy. Which of the two outcomes (all or nothing) prevails depends on the lobbying power of owners of fixed factors (land and fossil resources) but not on fiscal revenue considerations or on the lobbying power of renewable or fossil energy firms. KW - Climate policy KW - Optimal control KW - Political economy KW - Public finance KW - Credible policy KW - Time inconsistency Y1 - 2020 U6 - https://doi.org/10.1016/j.jeem.2019.01.012 SN - 0095-0696 SN - 1096-0449 VL - 100 PB - Elsevier CY - San Diego ER - TY - JOUR A1 - Strefler, Jessica A1 - Kriegler, Elmar A1 - Bauer, Nico A1 - Luderer, Gunnar A1 - Pietzcker, Robert C. A1 - Giannousakis, Anastasis A1 - Edenhofer, Ottmar T1 - Alternative carbon price trajectories can avoid excessive carbon removal JF - Nature communications N2 - The large majority of climate change mitigation scenarios that hold warming below 2 °C show high deployment of carbon dioxide removal (CDR), resulting in a peak-and-decline behavior in global temperature. This is driven by the assumption of an exponentially increasing carbon price trajectory which is perceived to be economically optimal for meeting a carbon budget. However, this optimality relies on the assumption that a finite carbon budget associated with a temperature target is filled up steadily over time. The availability of net carbon removals invalidates this assumption and therefore a different carbon price trajectory should be chosen. We show how the optimal carbon price path for remaining well below 2 °C limits CDR demand and analyze requirements for constructing alternatives, which may be easier to implement in reality. We show that warming can be held at well below 2 °C at much lower long-term economic effort and lower CDR deployment and therefore lower risks if carbon prices are high enough in the beginning to ensure target compliance, but increase at a lower rate after carbon neutrality has been reached. KW - climate-change mitigation KW - climate sciences KW - environmental sciences Y1 - 2021 U6 - https://doi.org/10.1038/s41467-021-22211-2 SN - 2041-1723 VL - 12 IS - 1 PB - Nature Publishing Group CY - London ER - TY - RPRT A1 - Kalkuhl, Matthias A1 - Flachsland, Christian A1 - Knopf, Brigitte A1 - Amberg, Maximilian A1 - Bergmann, Tobias A1 - Kellner, Maximilian A1 - Stüber, Sophia A1 - Haywood, Luke A1 - Roolfs, Christina A1 - Edenhofer, Ottmar T1 - Auswirkungen der Energiepreiskrise auf Haushalte in Deutschland BT - sozialpolitische Herausforderungen und Handlungsoptionen Y1 - 2022 UR - https://www.mcc-berlin.net/fileadmin/data/C18_MCC_Publications/2022_MCC_Auswirkungen_der_Energiepreiskrise_auf_Haushalte.pdf PB - Mercator Research Institute on Global Commons and Climate Change (MCC) gGmbH CY - Berlin ER - TY - JOUR A1 - Edenhofer, Ottmar A1 - Kalkuhl, Matthias A1 - Roolfs, Christina T1 - Carbon pricing and revenue recycling BT - an overview of vertical and horizontal equity effects for Germany JF - CESifo forum Y1 - 2021 UR - https://www.cesifo.org/DocDL/CESifo-Forum-2021-5-edenhofer-kalkuhl-roolfs-carbon-pricing-september.pdf SN - 2190-717X SN - 1615-245X VL - 22 IS - 5 SP - 10 EP - 14 PB - Ifo CY - Munich ER - TY - JOUR A1 - Edenhofer, Ottmar A1 - Kalkuhl, Matthias A1 - Ockenfels, Axel T1 - Das Klimaschutzprogramm der Bundesregierung BT - eine Wende der deutschen Klimapolitik? JF - Perspektiven der Wirtschaftspolitik N2 - Das Klimaschutzgesetz hat einen Paradigmenwechsel eingeleitet: den Einstieg in eine CO2-Bepreisung als künftiges Leitinstrument der Klimapolitik. Auf den ersten Blick ist der CO2-Preis unter einer Fülle von Fördermaßnahmen und ordnungsrechtlichen Regelungen verschüttet, deren Wirksamkeit und Kosten höchst unsicher sind. Der CO2-Preis ist aber so angelegt, dass er langfristig das dominante Instrument einer europäisch harmonisierten Klimapolitik werden kann. Der angedeutete Paradigmenwechsel der deutschen Klimapolitik öffnet damit die Tür, die europäische und internationale Kooperation zu stärken. Dazu ist es aber notwendig, neben der europäischen auch die globale Klimapolitik neu auszurichten. Auch dort sollten sich die Verhandlungen statt auf nationale Mengenziele auf CO2-Preise konzentrieren. Die erforderliche Kooperation wird möglich, wenn die Regierungen Transferzahlungen strategisch und reziprok nutzen. So könnte die Effektivität der Klimapolitik erhöht werden und es ließen sich die entstehenden Verteilungskonflikte entschärfen. KW - Klimaschutzgesetz KW - CO2-Preis KW - Emissionshandel KW - internationale Kooperation KW - Klimawandel KW - Klimapolitik KW - Deutschland KW - EU Y1 - 2020 U6 - https://doi.org/10.1515/pwp-2020-0001 SN - 1465-6493 SN - 1468-2516 VL - 21 IS - 1 SP - 4 EP - 18 PB - De Gruyter CY - Berlin ER - TY - JOUR A1 - Schultes, Anselm A1 - Piontek, Franziska A1 - Soergel, Bjoern A1 - Rogelj, Joeri A1 - Baumstark, Lavinia A1 - Kriegler, Elmar A1 - Edenhofer, Ottmar A1 - Luderer, Gunnar T1 - Economic damages from on-going climate change imply deeper near-term emission cuts JF - Environmental research letters N2 - Pathways toward limiting global warming to well below 2 ∘C, as used by the IPCC in the Fifth Assessment Report, do not consider the climate impacts already occurring below 2 ∘C. Here we show that accounting for such damages significantly increases the near-term ambition of transformation pathways. We use econometric estimates of climate damages on GDP growth and explicitly model the uncertainty in the persistence time of damages. The Integrated Assessment Model we use includes the climate system and mitigation technology detail required to derive near-term policies. We find an optimal carbon price of $115 per tonne of CO2 in 2030. The long-term persistence of damages, while highly uncertain, is a main driver of the near-term carbon price. Accounting for damages on economic growth increases the gap between the currently pledged nationally determined contributions and the welfare-optimal 2030 emissions by two thirds, compared to pathways considering the 2 ∘C limit only. KW - climate change KW - climate mitigation KW - climate impacts KW - integrated assessment Y1 - 2021 U6 - https://doi.org/10.1088/1748-9326/ac27ce SN - 1748-9326 VL - 16 IS - 10 PB - IOP Publishing CY - Bristol ER - TY - JOUR A1 - Piontek, Franziska A1 - Kalkuhl, Matthias A1 - Kriegler, Elmar A1 - Schultes, Anselm A1 - Leimbach, Marian A1 - Edenhofer, Ottmar A1 - Bauer, Nico T1 - Economic Growth Effects of Alternative Climate Change Impact Channels in Economic Modeling JF - Environmental & resource economics : the official journal of the European Association of Environmental and Resource Economists N2 - Despite increasing empirical evidence of strong links between climate and economic growth, there is no established model to describe the dynamics of how different types of climate shocks affect growth patterns. Here we present the first comprehensive, comparative analysis of the long-term dynamics of one-time, temporary climate shocks on production factors, and factor productivity, respectively, in a Ramsey-type growth model. Damages acting directly on production factors allow us to study dynamic effects on factor allocation, savings and economic growth. We find that the persistence of impacts on economic activity is smallest for climate shocks directly impacting output, and successively increases for direct damages on capital, loss of labor and productivity shocks, related to different responses in savings rates and factor-specific growth. Recurring shocks lead to large welfare effects and long-term growth effects, directly linked to the persistence of individual shocks. Endogenous savings and shock anticipation both have adaptive effects but do not eliminate differences between impact channels or significantly lower the dissipation time. Accounting for endogenous growth mechanisms increases the effects. We also find strong effects on income shares, important for distributional implications. This work fosters conceptual understanding of impact dynamics in growth models, opening options for links to empirics. KW - Climate change KW - Damages KW - Economic growth KW - Impact channels KW - Production factors KW - Persistence Y1 - 2018 U6 - https://doi.org/10.1007/s10640-018-00306-7 SN - 0924-6460 SN - 1573-1502 VL - 73 IS - 4 SP - 1357 EP - 1385 PB - Springer CY - Dordrecht ER - TY - RPRT A1 - Kalkuhl, Matthias A1 - Flachsland, Christian A1 - Knopf, Brigitte A1 - Amberg, Maximilian A1 - Bergmann, Tobias A1 - Kellner, Maximilian A1 - Stüber, Sophia A1 - Haywood, Luke A1 - Roolfs, Christina A1 - Edenhofer, Ottmar T1 - Effects of the energy price crisis on households in Germany BT - socio-political challenges and policy options Y1 - 2022 UR - https://www.mcc-berlin.net/fileadmin/data/C18_MCC_Publications/2022_MCC_Effects_of_the_energy_price_crisis_on_households.pdf PB - Mercator Research Institute on Global Commons and Climate Change (MCC) gGmbH CY - Berlin ER - TY - RPRT A1 - Kalkuhl, Matthias A1 - Amberg, Maximilian A1 - Bergmann, Tobias A1 - Knopf, Brigitte A1 - Edenhofer, Ottmar T1 - Gaspreisdeckel, Mehrwertsteuersenkung, Energiepauschale BT - wie kann die Bevölkerung zielgenau und schnell entlastet werden? Y1 - 2022 UR - https://www.mcc-berlin.net/fileadmin/data/C18_MCC_Publications/2022_MCC_Gaspreise_und_Entlastungsma%C3%9Fnahmen.pdf PB - Mercator Research Institute on Global Commons and Climate Change (MCC) gGmbH CY - Berlin ER - TY - JOUR A1 - Edenhofer, Ottmar A1 - Kalkuhl, Matthias A1 - Requate, Tilman A1 - Steckel, Jan Christoph T1 - How assets get stranded BT - the impact of climate policy on capital and fossil fuel owners : introduction to the JEEM special section on climate policy and political economy JF - Journal of environmental economics and management N2 - Internalizing external costs of carbon is a fundamental goal of climate policy. Since the seminal work of Arthur Pigou in 1920, economic theory has analyzed the efficiency gains arising from various instruments that internalize externalities and lead to Pareto-improvements. It is widely recognized in environmental economics that a carbon price would effectively reflect the scarcity of the atmospheric disposal space for carbon depending on the temperature target that is to be achieved. The question of how to organize the transition process, i.e. moving from inefficient to efficient allocations, and implementing the necessary policies, has gained increasing attention in recent years. Arguably, the transition process is tightly interwoven with political processes that include complex interactions between societal stakeholders, such as households and firms, on the one hand, and political decision makers, on the other. Accordingly, understanding political-economy aspects of the transition process, including distributional outcomes, is becoming increasingly relevant. While a growing literature discusses the distributional implications of climate policy on households, it is less well understood how asset owners might be affected by climate policy and how these potential impacts would interact with the transition process. This Special Section focuses on public policy challenges related to this transition problem, with special emphasis on asset owners. A core theme is the special role of stranded assets, i.e. a devaluation of capital stocks or financial assets either by introducing a stringent carbon price or by omitting a pre-announced policy of this kind. Y1 - 2020 U6 - https://doi.org/10.1016/j.jeem.2020.102300 SN - 0095-0696 SN - 1096-0449 VL - 100 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Hänsel, Martin C. A1 - Franks, Max A1 - Kalkuhl, Matthias A1 - Edenhofer, Ottmar T1 - Optimal carbon taxation and horizontal equity BT - a welfare-theoretic approach with application to German household data JF - Journal of environmental economics and management N2 - We develop a model of optimal taxation and redistribution under an ambitious climate target. We take into account vertical income differences, but also explicitly capture horizontal equity concerns by considering heterogeneous energy efficiencies. By deriving first- and second-best rules for policy instruments including carbon and labor taxes, transfers and energy subsidies, we investigate analytically how vertical and horizontal inequality is considered in the welfare maximizing tax structure. We calibrate the model to German household data and a 30 percent emission reduction goal and show that redistribution of carbon tax revenues via household-specific transfers is the first-best policy. Under plausible assumptions on inequality aversion, transfers to energy-intensive households should be about five times higher than transfers to energy-efficient households. Equal per-capita transfers do not require to observe households’ efficiency type, but increase equity-weighted mitigation costs by around 5 percent compared to the first-best. Mitigation costs increase by less, if the government can implement a uniform clean energy subsidy or household-specific tax-subsidy schemes on energy consumption and labor income that target heterogeneous energy efficiencies. Horizontal equity concerns may therefore constitute a new second-best rationale for clean energy policies or differentiated energy taxes. Y1 - 2022 U6 - https://doi.org/10.1016/j.jeem.2022.102730 SN - 0095-0696 SN - 1096-0449 VL - 116 PB - Elsevier CY - Amsterdam ER - TY - RPRT A1 - Hänsel, Martin C. A1 - Franks, Max A1 - Kalkuhl, Matthias A1 - Edenhofer, Ottmar T1 - Optimal carbon taxation and horizontal equity BT - A welfare-theoretic approach with application to German household data T2 - CEPA Discussion Papers N2 - We develop a model of optimal carbon taxation and redistribution taking into account horizontal equity concerns by considering heterogeneous energy efficiencies. By deriving first- and second-best rules for policy instruments including carbon taxes, transfers and energy subsidies, we then investigate analytically how horizontal equity is considered in the social welfare maximizing tax structure. We calibrate the model to German household data and a 30 percent emission reduction goal. Our results show that energy-intensive households should receive more redistributive resources than energy-efficient households if and only if social inequality aversion is sufficiently high. We further find that redistribution of carbon tax revenue via household-specific transfers is the first-best policy. Equal per-capita transfers do not suffer from informational problems, but increase mitigation costs by around 15 percent compared to the first- best for unity inequality aversion. Adding renewable energy subsidies or non-linear energy subsidies, reduces mitigation costs further without relying on observability of households’ energy efficiency. T3 - CEPA Discussion Papers - 28 KW - carbon price KW - horizontal equity KW - redistribution KW - renewable energy subsidies KW - climate policy KW - just transition Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-498128 SN - 2628-653X IS - 28 ER - TY - JOUR A1 - Edenhofer, Ottmar A1 - Franks, Max A1 - Kalkuhl, Matthias T1 - Pigou in the 21st century BT - a tribute on the occasion of the 100th anniversary of the publication of The Economics of Welfare JF - International tax and public finance N2 - The year 2020 marks the centennial of the publication of Arthur Cecil Pigou's magnum opus The Economics of Welfare. Pigou's pricing principles have had an enduring influence on the academic debate, with a widespread consensus having emerged among economists that Pigouvian taxes or subsidies are theoretically desirable, but politically infeasible. In this article, we revisit Pigou's contribution and argue that this consensus is somewhat spurious, particularly in two ways: (1) Economists are too quick to ignore the theoretical problems and subtleties that Pigouvian pricing still faces; (2) The wholesale skepticism concerning the political viability of Pigouvian pricing is at odds with its recent practical achievements. These two points are made by, first, outlining the theoretical and political challenges that include uncertainty about the social cost of carbon, the unclear relationship between the cost-benefit and cost-effectiveness approaches, distributional concerns, fragmented ministerial responsibilities, an unstable tax base, commitment problems, lack of acceptance and trust between government and citizens as well as incomplete international cooperation. Secondly, we discuss the recent political success of Pigouvian pricing, as evidenced by the German government's 2019 climate policy reform and the EU's Green Deal. We conclude by presenting a research agenda for addressing the remaining barriers that need to be overcome to make Pigouvian pricing a common political practice. KW - Environmental economics KW - Climate change economics KW - Carbon pricing KW - Pigouvian taxation KW - Economic policy Y1 - 2021 U6 - https://doi.org/10.1007/s10797-020-09653-y SN - 0927-5940 SN - 1573-6970 VL - 28 IS - 5 SP - 1090 EP - 1121 PB - Springer CY - Dordrecht ER - TY - RPRT A1 - Kalkuhl, Matthias A1 - Franks, Max A1 - Gruner, Friedemann A1 - Lessmann, Kai A1 - Edenhofer, Ottmar T1 - Pigou’s Advice and Sisyphus’ Warning BT - Carbon Pricing with Non-Permanent Carbon-Dioxide Removal T2 - CEPA Discussion Papers N2 - Carbon dioxide removal from the atmosphere is becoming an important option to achieve net zero climate targets. This paper develops a welfare and public economics perspective on optimal policies for carbon removal and storage in non-permanent sinks like forests, soil, oceans, wood products or chemical products. We derive a new metric for the valuation of non-permanent carbon storage, the social cost of carbon removal (SCC-R), which embeds also the conventional social cost of carbon emissions. We show that the contribution of CDR is to create new carbon sinks that should be used to reduce transition costs, even if the stored carbon is released to the atmosphere eventually. Importantly, CDR does not raise the ambition of optimal temperature levels unless initial atmospheric carbon stocks are excessively high. For high initial atmospheric carbon stocks, CDR allows to reduce the optimal temperature below initial levels. Finally, we characterize three different policy regimes that ensure an optimal deployment of carbon removal: downstream carbon pricing, upstream carbon pricing, and carbon storage pricing. The policy regimes differ in their informational and institutional requirements regarding monitoring, liability and financing. T3 - CEPA Discussion Papers - 62 KW - Carbon Dioxide Removal KW - Carbon Capture KW - Social Cost of Carbon KW - Climate Policy KW - Impermanence Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-575882 SN - 2628-653X IS - 62 ER - TY - JOUR A1 - Kalkuhl, Matthias A1 - Edenhofer, Ottmar T1 - Ramsey meets Thünen BT - the impact of land taxes on economic development and land conservation JF - International tax and public finance N2 - Land taxes can increase production in the manufacturing sector and enhance land conservation at the same time, which can lead to overall macroeconomic growth. Existing research emphasizes the non-distorting properties of land taxes (when fixed factors are taxed) as well as growth-enhancing impacts (when asset portfolios are shifted to reproducible capital). This paper furthers the neoclassical perspective on land taxes by endogenizing land allocation decisions in a multi-sector growth model. Based on von Thünen’s observation, agricultural land is created from wilderness through conversion and cultivation, both of which are associated with costs. In the steady state of our general equilibrium model, land taxes not only may reduce land consumption (associated with environmental benefits) but may also affect overall economic output, while leaving wages and interest rates unaffected. When labor productivity is higher in the manufacturing than in the agricultural sector and agricultural and manufactured goods are substitutes (or the economy is open to world trade), land taxes increase aggregate economic output. There is a complex interplay of conservation policy, technological change and land taxes, depending on consumer preferences, sectoral labor productivities and openness-to-trade. Our model introduces a new perspective on land taxes in current policy debates on development, tax reforms as well as forest conservation. KW - Structural shift KW - Structural change KW - REDD KW - Henry George KW - Forest conservation KW - Sustainability KW - Johann Heinrich von Thunen Y1 - 2016 U6 - https://doi.org/10.1007/s10797-016-9403-6 SN - 0927-5940 SN - 1573-6970 VL - 24 SP - 350 EP - 380 PB - Springer CY - Dordrecht ER - TY - JOUR A1 - Amberg, Maximilian A1 - aus dem Moore, Nils A1 - Bekk, Anke A1 - Bergmann, Tobias A1 - Edenhofer, Ottmar A1 - Flachsland, Christian A1 - George, Jan A1 - Haywood, Luke A1 - Heinemann, Maik A1 - Held, Anne A1 - Kalkuhl, Matthias A1 - Kellner, Maximilian A1 - Koch, Nicolas A1 - Luderer, Gunnar A1 - Meyer, Henrika A1 - Nikodinoska, Dragana A1 - Pahle, Michael A1 - Roolfs, Christina A1 - Schill, Wolf-Peter T1 - Reformoptionen für ein nachhaltiges Steuer- und Abgabensystem BT - wie Lenkungssteuern effektiv und gerecht für den Klima- und Umweltschutz ausgestaltet werden können JF - Perspektiven der Wirtschaftspolitik N2 - Steuern und Abgaben auf Produkte oder Verbrauch mit gesellschaftlichen Folgekosten (externe Kosten) – sogenannte Pigou- oder Lenkungssteuern – sind ein gesellschaftliches „Win-Win-Instrument“. Sie verbessern die Wohlfahrt und schützen gleichzeitig die Umwelt und das Klima. Dies wird erreicht, indem umweltschädigende Aktivitäten einen Preis bekommen, der möglichst exakt der Höhe des Schadens entspricht. Eine konsequente Bepreisung der externen Kosten nach diesem Prinzip könnte in Deutschland erhebliche zusätzliche Einnahmen erbringen: Basierend auf bisherigen Studien zu externen Kosten wären zusätzliche Einnahmen in der Größenordnung von 348 bis 564 Milliarden Euro pro Jahr (44 bis 71 Prozent der gesamten Steuereinnahmen) möglich. Die Autoren warnen allerdings, dass die Bezifferung der externen Kosten mit erheblichen Unsicherheiten verbunden ist. Damit Lenkungssteuern und -abgaben ihre positiven Lenkungs- und Wohlstandseffekte voll entfalten können, seien zudem institutionelle Reformen notwendig. KW - Externalitäten KW - Pigou-Steuern KW - Nachhaltige Steuerreform KW - Energiewende Y1 - 2022 U6 - https://doi.org/10.1515/pwp-2021-0051 SN - 1465-6493 SN - 1468-2516 VL - 23 IS - 3 SP - 165 EP - 199 PB - De Gruyter CY - Berlin ER - TY - GEN A1 - Kalkuhl, Matthias A1 - Steckel, Jan Christoph A1 - Montrone, Lorenzo A1 - Jakob, Michael A1 - Peters, Jörg A1 - Edenhofer, Ottmar T1 - Successful coal phase-out requires new models of development T2 - Nature Energy N2 - Different energy sources have different spillovers on economic development and industrialization. Pathways of economic development based on renewable energy sources might require additional policies to support industrial development. Y1 - 2019 U6 - https://doi.org/10.1038/s41560-019-0500-5 SN - 2058-7546 VL - 4 IS - 11 SP - 897 EP - 900 PB - Nature Publ. Group CY - London ER -