MASSACHUSETTS INSTITUTE OF TECHNOLOGY MIT JOINT PROGRAM ON THE SCIENCE AND POLICY OF GLOBAL CHANGE 2021 GLOBAL CHANGE OUTLOOK CHARTING THE EARTH’S FUTURE ENERGY, MANAGED RESOURCES, CLIMATE, AND POLICY PROSPECTS LEAD AUTHORS Sergey Paltsev • C. Adam Schlosser CO-AUTHORS Henry Chen • Xiang Gao • Angelo Gurgel • Henry Jacoby • Jennifer Morris • Ronald Prinn • Andrei Sokolov • Kenneth Strzepek CONTRIBUTORS Noelle Selin, MIT Institute for Data Systems & Society/MIT Department of Earth, Atmospheric & Planetary Sciences • Richard Schmalensee, MIT Sloan School of Management • Lucy Young, MIT DESIGN & EDITING Jamie Bartholomay • Mark Dwortzan • Jennifer Morris • Anne Slinn MASSACHUSETTS INSTITUTE OF TECHNOLOGY THE MIT JOINT PROGRAM ON THE SCIENCE & POLICY OF GLOBAL CHANGE is working to advance a sustainable, prosperous world through scientific analysis of the complex interactions among co-evolving global systems. MISSION Advancing a sustainable, prosperous world through scientific analysis of the complex interactions among co-evolving global systems. The pace and complexity of global environmental change is unprecedented. Nations, regions, cities and the public and private sectors are facing increasing pressures to confront critical challenges in future food, water, energy, climate and other areas. Our integrated team of natural and social scientists produces comprehensive global and regional change projections under different environmental, economic and policy scenarios. These projections enable decision-makers in the public and private sectors to better assess impacts, and the associated costs and benefits of potential courses of action. VISION We envision a world in which community, government and industry leaders have the insight they need to make environmentally and economically sound choices. Toward that end, we provide a scientific foundation for strategic investment, policymaking and other decisions that advance sustainable development. IMPACT The MIT Joint Program: • Combines scientific research with risk and policy analyses to project the impacts of—and evaluate possible responses to—the many interwoven challenges of global socioeconomic, technological and environmental change. • Communicates research findings through our website, publications, workshops and presentations around the world, as well as frequent interactions with decision-makers, media outlets, government and nongovernmental organizations, schools and communities. • Cultivates and educates the next generation of interdisciplinary researchers with the skills to tackle ongoing and emerging complex global challenges. 2021 Outlook: Charting the Earth’s Future Energy · Managed Resources · Climate · Policy Prospects The 2021 Global Change Outlook continues a process, started in 2012 by the MIT Joint Program, of providing a periodic update on the direction the planet is heading in terms of economic growth and its implications for resource use and the environment. To obtain an integrated look at food, water, energy and climate, as well as the oceans, atmosphere and land that comprise the Earth system, we use the MIT Integrated Global System Modeling (IGSM) framework. Consisting primarily of the Economic Projection and Policy Analysis (EPPA) model and the MIT Earth System Model (MESM), the IGSM is a linked set of computer models developed by the MIT Joint Program to analyze interactions among human and Earth systems. As in our previous (2018) edition, this year’s Outlook reports on projected effects of population and economic growth, technology improvements, climate policy and other factors on energy and land use, emissions and climate, and water and agriculture. An important first step toward achieving stabilization of global average temperatures at reasonable cost is the Paris Agreement, in which nearly 200 countries committed to a wide range of initial climate actions aimed at achieving that goal. For this year’s Outlook, we have invited guest contributors to offer perspectives on the impact of the Covid-19 pandemic on economic growth, climate mitigation and public health, as well as the need for a systems approach to climate change and human health and well-being. Recognizing the inadequacy of the short-term commitments to keep global warming below the long-term targets of 2°C or even 1.5°C, we explore emissions pathways consistent with these goals. CONTENTS About the 2021 Outlook 2 Impacts of the Covid-19 Pandemic 2 Policy Scenarios and Risk-Based Analyses 2 Key Findings 4 Energy 4 Emissions and Climate 4 Managed Resources 6 Meeting Short-Term Paris Commitments 7 Long-Term Climate Stabilization Goals 7 Drivers of Global Change 8 Population and Economic Growth 8 Policy Scenarios 8 Energy 12 Primary Energy Use 12 Regional Energy Intensity Improvements 14 Electrification of Light-Duty Vehicles 15 Electricity Production 17 Energy Prices 19 Managed Resources 20 Water 20 Agriculture 22 Land-Use Change 24 Climate 26 GHG Emissions by Gas/Source and Region 26 Implications of Recent Emissions Trends and Future Projections 28 Climate Risk: Physical Risk 32 Climate Risk: Transition Risk 36 Policy Prospects 38 Prospects for Meeting Short-Term Paris Goals 38 Prospects for Meeting Long-Term Paris Goals 39 References 42 Appendix 43 MIT JOINT PROGRAM ON THE SCIENCE AND POLICY OF GLOBAL CHANGE 2021 OUTLOOK • 1 About the 2021 Outlook The 2021 Global Change Outlook presents mate goals. However, the negative impacts the MIT Joint Program’s latest projections of the pandemic on economic growth and Key Terms: for the future of the Earth’s energy, man- emergency measures to stimulate national CCS Carbon Capture and Storage aged resources (including water, agriculture economies provide a complex picture for CO2e CO2-equivalent and land), and climate, as well as pros- achieving future decarbonization goals. In pects for achieving the Paris Agreement’s slow-growth economies, fewer resources EPPA MIT Economic Projection & Policy Analysis (model) short-term targets (as defined by Nationally are available for governments to support Determined Contributions, or NDCs) and clean energy alternatives and for private GHG Greenhouse Gases long-term goals of keeping the increase in companies to invest in new technologies. IGSM Integrated Global System the average global temperature below 2°C In high-growth economies, rising energy Modeling (framework) or even 1.5°C. demand and prices provide substantial in- IPCC Interngovernmental Panel on centives for energy-efficient innovations. Climate Change Impacts of the Covid-19 Regardless of the pace of economic devel- MESM MIT Earth System Model opment, governments need to intervene NDC Nationally Determined Pandemic to promote a climate sustainability agenda, Contribution In 2020, Covid-19 captured the world’s at- but resources available for such interven- UNFCCC United Nations Framework tention. Throughout the year, the pandemic tions are highly affected by the Covid-19 Convention on Climate Change impacted billions of lives. The massive impact crisis. The pandemic has also exacerbated WRS Water Resource System (model) of the virus on lives and economies presents negative trends related to protectionism, Units of Measurement: important parallels to the risks and threats we populism and nationalism. For a climate °C Degrees Celsius TWh Terawatt hours face from human-induced changes to climate. problem that requires a global solution, For both challenges, the well-being and sur- these negative tendencies make efforts to EJ Exajoules ppm Parts per vival of our growing and interconnected establish global decarbonization pathways Gt Gigatonnes million society hinge on our willingness to confront even more challenging. threats that have global consequences. Key to In the 2021 Outlook, we include an assess- through the year 2030, and maintained in protecting lives and making our communities ment of Covid-19 impacts on economic more resilient to such threats is an emphasis perpetuity after that. While our Paris For- growth, energy and emissions. The Covid-19 ever scenario represents an unprecedented on proactive, science-based decision-making pandemic is projected to have a short-term at all levels of society. global commitment to limit greenhouse gas direct impact on greenhouse gas (GHG) emissions, it neither stabilizes climate nor For Covid-19, the scientific process has elu- emissions. The longer-term effect will be limits climate change. cidated the importance and benefits of most pronounced if it acts as a catalyst for non-therapeutic measures (e.g. masks, social accelerating the energy transition. Ulti- We therefore consider two additional distancing) to slow transmission and reduce mately, government policies and industrial scenarios that extend from the Paris Agree- mortality rates from the virus. Yet crucial to technological leadership will be needed for ment’s NDCs and align with its long-term reducing the threats, avoiding the risks and aggressive GHG mitigation. goals. Referred to as Paris 2°C and Paris 1.5°C, averting the dangers, is the societal respon- these scenarios aim to limit and stabilize sibility to act upon scientific evidence in a Policy Scenarios and human-induced global climate warming timely manner. We have seen encouraging to 2°C and 1.5°C, respectively, by the end and effective actions with tangible results Risk-Based Analyses of this century. The Paris 1.5°C scenario en- during the pandemic in several nations and As with previous Outlooks, our intent is visions global cooperation that leads to an states. Similarly, timely science-based