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Energy-Aware System Design: Algorithms and Architectures
by Chong-Min Kyung and Sungjoo YooPower consumption becomes the most important design goal in a wide range of electronic systems. There are two driving forces towards this trend: continuing device scaling and ever increasing demand of higher computing power. First, device scaling continues to satisfy Moore’s law via a conventional way of scaling (More Moore) and a new way of exploiting the vertical integration (More than Moore). Second, mobile and IT convergence requires more computing power on the silicon chip than ever. Cell phones are now evolving towards mobile PC. PCs and data centers are becoming commodities in house and a must in industry. Both supply enabled by device scaling and demand triggered by the convergence trend realize more computation on chip (via multi-core, integration of diverse functionalities on mobile SoCs, etc.) and finally more power consumption incurring power-related issues and constraints. Energy-Aware System Design: Algorithms and Architectures provides state-of-the-art ideas for low power design methods from circuit, architecture to software level and offers design case studies in three fast growing areas of mobile storage, biomedical and security.Important topics and features:- Describes very recent advanced issues and methods for energy-aware design at each design level from circuit and architecture to algorithm level, and also covering important blocks including low power main memory subsystem and on-chip network at architecture level- Explains efficient power conversion and delivery which is becoming important as heterogeneous power sources are adopted for digital and non-digital parts - Investigates 3D die stacking emphasizing temperature awareness for better perspective on energy efficiency- Presents three practical energy-aware design case studies; novel storage device (e.g., solid state disk), biomedical electronics (e.g., cochlear and retina implants), and wireless surveillance camera systems.Researchers and engineers in the field of hardware and software design will find this book an excellent starting point to catch up with the state-of-the-art ideas of low power design.
Energy Balance Climate Models (Wiley Series in Atmospheric Physics and Remote Sensing)
by Gerald R. North Kwang-Yul KimWritten by renowned experts in the field, this first book to focus exclusively on energy balance climate models provides a concise overview of the topic. It covers all major aspects, from the simplest zero-dimensional models, proceeding to horizontally and vertically resolved models. The text begins with global average models, which are explored in terms of their elementary forms yielding the global average temperature, right up to the incorporation of feedback mechanisms and some analytical properties of interest. The effect of stochastic forcing is then used to introduce natural variability in the models before turning to the concept of stability theory. Other one dimensional or zonally averaged models are subsequently presented, along with various applications, including chapters on paleoclimatology, the inception of continental glaciations, detection of signals in the climate system, and optimal estimation of large scale quantities from point scale data. Throughout the book, the authors work on two mathematical levels: qualitative physical expositions of the subject material plus optional mathematical sections that include derivations and treatments of the equations along with some proofs of stability theorems. A must-have introduction for policy makers, environmental agencies, and NGOs, as well as climatologists, molecular physicists, and meteorologists.
Energy Balance Climate Models (Wiley Series in Atmospheric Physics and Remote Sensing)
by Gerald R. North Kwang-Yul KimWritten by renowned experts in the field, this first book to focus exclusively on energy balance climate models provides a concise overview of the topic. It covers all major aspects, from the simplest zero-dimensional models, proceeding to horizontally and vertically resolved models. The text begins with global average models, which are explored in terms of their elementary forms yielding the global average temperature, right up to the incorporation of feedback mechanisms and some analytical properties of interest. The effect of stochastic forcing is then used to introduce natural variability in the models before turning to the concept of stability theory. Other one dimensional or zonally averaged models are subsequently presented, along with various applications, including chapters on paleoclimatology, the inception of continental glaciations, detection of signals in the climate system, and optimal estimation of large scale quantities from point scale data. Throughout the book, the authors work on two mathematical levels: qualitative physical expositions of the subject material plus optional mathematical sections that include derivations and treatments of the equations along with some proofs of stability theorems. A must-have introduction for policy makers, environmental agencies, and NGOs, as well as climatologists, molecular physicists, and meteorologists.
Energy Balance in Motion (SpringerBriefs in Physiology)
by Klaas R. WesterterpEnergy balance can be maintained by adapting energy intake to changes in energy expenditure and vice versa, where short-term changes in energy expenditure are mainly caused by physical activity. Questions are whether physical activity is affected by over and under-eating, is intake affected by an increase or a decrease in physical activity, and does overweight affect physical activity? Presented evidence is largely based on studies where physical activity is quantified with doubly labeled water. Overeating does not affect physical activity while under-eating decreases habitual or voluntary physical activity. Thus, it is easier to gain weight than to lose weight. An exercise induced increase in energy requirement is compensated by intake while a change to a more sedentary routine does not induce an equivalent reduction of intake and generally results in weight gain. Overweight and obese subjects have similar activity energy expenditures than lean people despite they move less. There are two options to reverse the general population trend for an increasing body weight, reducing intake or increasing physical activity. Based on the results presented, eating less is most effective for preventing weight gain, despite a potential negative effect on physical activity when reaching a negative energy balance.
Energy-Based Control of Electromechanical Systems: A Novel Passivity-Based Approach (Advances in Industrial Control)
by Victor Manuel Hernández-Guzmán Ramón Silva-Ortigoza Jorge Alberto Orrante-SakanassiThis book introduces a passivity-based approach which simplifies the controller design task for AC-motors. It presents the application of this novel approach to several classes of AC motors, magnetic levitation systems, microelectromechanical systems (MEMS) and rigid robot manipulators actuated by AC motors. The novel passivity-based approach exploits the fact that the natural energy exchange existing between the mechanical and the electrical subsystems allows the natural cancellation of several high order terms during the stability analysis. This allows the authors to present some of the simplest controllers proposed in scientific literature, but provided with formal stability proofs. These simple control laws will be of use to practitioners as they are robust with respect to numerical errors and noise amplification, and are provided with tuning guidelines. Energy-based Control of Electromechanical Systems is intended for both theorists and practitioners. Therefore, the stability proofs are not based on abstract mathematical ideas but Lyapunov stability theory. Several interpretations of the proofs are given along the body of the book using simple energy ideas and the complete proofs are included in appendices. The complete modeling of each motor studied is also presented, allowing for a thorough understanding.Advances in Industrial Control reports and encourages the transfer of technology in control engineering. The rapid development of control technology has an impact on all areas of the control discipline. The series offers an opportunity for researchers to present an extended exposition of new work in all aspects of industrial control.
The Energy-Climate Continuum: Lessons from Basic Science and History
by Antoine BretThis book puts the debates about the energy-climate continuum on a scientific ground!It is a must-read for everyone, who wants to understand how intimately the energy and climate debates are linked to each other, and who wants to participate in these omnipresent discussions. Antoine Bret explains in his book how fossil fuels became indispensable for our society. He carefully explains how and why this impacts the earth's climate. And he points out that all available fossil fuels will sooner or later be used up. Therefore, he introduces and discusses the alternatives, which are currently considered. The book is divided into three parts. The first part explains the problem and where we stand today, the second part critically discusses possible elements of solution. The third part illustrates historic case studies, containing both warning as well as encouraging examples of societies at turning points.This book is a careful introduction to these topics. The basic science behind the problem and the debates are introduced in an understandable and nicely readable fashion. Facts are illustrated with simple back-on-the-envelope calculations, providing a good feeling for orders of magnitudes. A rich appendix provides additional background information for the interested readers. In this way, the book can even be a valuable resource for introductory university courses in physics, climate science, natural science and many more subjects.This book is a real conversation starter and can be recommended to everyone, specialist or non-specialist, who wants to understand the actual energy-climate debates and maybe even involve.
Energy, Complexity and Wealth Maximization (The Frontiers Collection)
by Robert AyresThis book is about the mechanisms of wealth creation, or what we like to think of as evolutionary "progress." The massive circular flow of goods and services between producers and consumers is not a perpetual motion machine; it has been dependent for the past 150 years on energy inputs from a finite storage of fossil fuels. In this book, you will learn about the three key requirements for wealth creation, and how this process acts according to physical laws, and usually after some part of the natural wealth of the planet has been exploited in an episode of "creative destruction." Knowledge and natural capital, particularly energy, will interact to power the human wealth engine in the future as it has in the past. Will it sputter or continue along the path of evolutionary progress that we have come to expect? Can the new immaterial wealth of information and ideas, which makes up the so-called knowledge economy, replace depleted natural wealth? These questions have no simple answers, but this masterful book will help you to understand the grand challenge of our time.Praise for Energy, Complexity and Wealth Maximization:“... people who run the modern world (politicians, economists and lawyers) have a very poor grasp of how it really works because they do not understand the fundamentals of energy, exergy and entropy ... those decision-makers would greatly benefit from reading this book ...” - Vaclav Smil, Distinguished Professor Emeritus, University of Manitoba“... A grandiose design; impressive, worth reading and reflecting!” - Prof. Dr. Ernst Ulrich von Weizäcker, Founder of Wuppertal Institute; Co-President of the Club of Rome, Former Member of the German Bundestag, co-chair of the UN’s Resource Panel“... The book is a must read for concerned citizens and decision makers across the globe.” - RK Pachauri, Founder and Executive Vice Chairman, The Energy and Resources Institute (TERI) and ex-chair, International Panel on Climate Change (IPCC)
Energy Conservation in Biological Membranes: 29. Colloquium, 6.-8. April 1978 (Colloquium der Gesellschaft für Biologische Chemie in Mosbach Baden #29)
by G. Schäfer M. Klingenberg
Energy Conservation in Residential, Commercial, and Industrial Facilities (IEEE Press Series on Systems Science and Engineering)
by Hossam A. GabbarAn authoritative and comprehensive guide to managing energy conservation in infrastructures Energy Conservation in Residential, Commercial, and Industrial Facilities offers an essential guide to the business models and engineering design frameworks for the implementation of energy conservation in infrastructures. The presented models of both physical and technological systems can be applied to a wide range of structures such as homes, hotels, public facilities, industrial facilities, transportation, and water/energy supply systems. The authors—noted experts in the field—explore the key performance indicators that are used to evaluate energy conservation strategies and the energy supply scenarios as part of the design and operation of energy systems in infrastructures. The text is based on a systems approach that demonstrates the effective management of building energy knowledge and supports the simulation, evaluation, and optimization of several building energy conservation scenarios. In addition, the authors explore new methods of developing energy semantic network (ESN) superstructures, energy conservation optimization techniques, and risk-based life cycle assessments. This important text: Defines the most effective ways to model the infrastructure of physical and technological systems Includes information on the most widely used techniques in the validation and calibration of building energy simulation Offers a discussion of the sources, quantification, and reduction of uncertainty Presents a number of efficient energy conservation strategies in infrastructure systems, including HVAC, lighting, appliances, transportation, and industrial facilities Describes illustrative case studies to demonstrate the proposed energy conservation framework, practices, methods, engineering designs, control, and technologies Written for students studying energy conservation as well as engineers designing the next generation of buildings, Energy Conservation in Residential, Commercial, and Industrial Facilities offers a wide-ranging guide to the effective management of energy conservation in infrastructures.
Energy Conservation in Residential, Commercial, and Industrial Facilities (IEEE Press Series on Systems Science and Engineering)
by Hossam A. GabbarAn authoritative and comprehensive guide to managing energy conservation in infrastructures Energy Conservation in Residential, Commercial, and Industrial Facilities offers an essential guide to the business models and engineering design frameworks for the implementation of energy conservation in infrastructures. The presented models of both physical and technological systems can be applied to a wide range of structures such as homes, hotels, public facilities, industrial facilities, transportation, and water/energy supply systems. The authors—noted experts in the field—explore the key performance indicators that are used to evaluate energy conservation strategies and the energy supply scenarios as part of the design and operation of energy systems in infrastructures. The text is based on a systems approach that demonstrates the effective management of building energy knowledge and supports the simulation, evaluation, and optimization of several building energy conservation scenarios. In addition, the authors explore new methods of developing energy semantic network (ESN) superstructures, energy conservation optimization techniques, and risk-based life cycle assessments. This important text: Defines the most effective ways to model the infrastructure of physical and technological systems Includes information on the most widely used techniques in the validation and calibration of building energy simulation Offers a discussion of the sources, quantification, and reduction of uncertainty Presents a number of efficient energy conservation strategies in infrastructure systems, including HVAC, lighting, appliances, transportation, and industrial facilities Describes illustrative case studies to demonstrate the proposed energy conservation framework, practices, methods, engineering designs, control, and technologies Written for students studying energy conservation as well as engineers designing the next generation of buildings, Energy Conservation in Residential, Commercial, and Industrial Facilities offers a wide-ranging guide to the effective management of energy conservation in infrastructures.
Energy Consumption and Autonomous Driving: Proceedings of the 3rd CESA Automotive Electronics Congress, Paris, 2014 (Lecture Notes in Mobility)
by Jochen LangheimThis volume collects selected papers of the 3rd CESA Automotive Electronics Congress, Paris, 2014. CESA is the most important automotive electronics conference in France. The topical focus lies on state-of-the-art automotive electronics with respect to energy consumption and autonomous driving. The target audience primarily comprises industry leaders and research experts in the automotive industry.
Energy Consumption, Chemical Use and Carbon Footprints of Wastewater Treatment Alternatives: Assessment Methodology and Sustainability Solutions (Springer Theses)
by Xu WangThis thesis focuses on the energy, chemical and carbon implications of diverse wastewater treatment alternatives, and offers effective solutions for wastewater treatment plants (WWTPs) to achieve sustainability goals. The author first uses the life cycle philosophy to explore the environmental performance of several representative wastewater treatment systems, and then proposes a refined assessment framework, accompanying analytical toolkit and case study for further quantifying the environmental sustainability of various wastewater management scenarios. Allowing readers to gain a better understanding of the existing wastewater treatment technologies from a sustainability perspective, this book helps decision makers identify promising approaches to the environmentally friendly operation of WWTPs and make infrastructure investments that are appropriate for future changing conditions.
The Energy Consumption in Refrigerated Warehouses (EcoProduction)
by Pawel ZajacThis book explores the philosophical understanding of the “energy consumption” in warehousing process that can be found in the literature. It presents known technical solutions that, if they are used in cold storage rooms, can effectively reduce energy consumption: through lower power consumption and/or energy recovery, such as the use of photovoltaic panels. The final part of the book explores the problems discussed on the basis of a concrete example – a project involving energy recovery in a refrigerated warehouse.This publication also describes the design of refrigerated warehouses, taking into account their energy intensity. In the case of logistic warehousing systems, the pallets in warehouses can offer a source of energy – namely of the potential energy stored in the loads on the shelves. Given that today’s construction warehouses have heights on the order of several tens of meters, that energy can be considerable. In the case of refrigerated warehouses and cold storage facilities, it is necessary to monitor the stored goods in order to maintain a constant freezing temperature, in keeping with the requirements of the HACCP system. Inevitably, this calls for constant cooling of the air inside the warehouse, and thus produces a fixed, high and constant level of energy usage. And, just as in any other context, it becomes important to identify methods for reducing energy consumption.
Energy Conversion (Mechanical and Aerospace Engineering Series)
by D. Yogi Goswami Frank KreithThis handbook surveys the range of methods and fuel types used in generating energy for industry, transportation, and heating and cooling of buildings. Solar, wind, biomass, nuclear, geothermal, ocean and fossil fuels are discussed and compared, and the thermodynamics of energy conversion is explained. Appendices are provided with fully updated data. Thoroughly revised, this second edition surveys the latest advances in energy conversion from a wide variety of currently available energy sources. It describes energy sources such as fossil fuels, biomass (including refuse-derived biomass fuels), nuclear, solar radiation, wind, geothermal, and ocean, then provides the terminology and units used for each energy resource and their equivalence. It includes an overview of the steam power cycles, gas turbines, internal combustion engines, hydraulic turbines, Stirling engines, advanced fossil fuel power systems, and combined-cycle power plants. It outlines the development, current use, and future of nuclear power.
Energy Conversion (Mechanical and Aerospace Engineering Series)
by D. Yogi Goswami Frank KreithThis handbook surveys the range of methods and fuel types used in generating energy for industry, transportation, and heating and cooling of buildings. Solar, wind, biomass, nuclear, geothermal, ocean and fossil fuels are discussed and compared, and the thermodynamics of energy conversion is explained. Appendices are provided with fully updated data. Thoroughly revised, this second edition surveys the latest advances in energy conversion from a wide variety of currently available energy sources. It describes energy sources such as fossil fuels, biomass (including refuse-derived biomass fuels), nuclear, solar radiation, wind, geothermal, and ocean, then provides the terminology and units used for each energy resource and their equivalence. It includes an overview of the steam power cycles, gas turbines, internal combustion engines, hydraulic turbines, Stirling engines, advanced fossil fuel power systems, and combined-cycle power plants. It outlines the development, current use, and future of nuclear power.
Energy Conversion and Management: Principles and Applications
by Giovanni PetreccaThis book provides an overall view of energy conversion and management in industry and in buildings by following the streams of energy from the site boundaries to the end users. Written for an audience of both practitioners and faculty/students, Energy Conversion and Management: Principles and Applications presents general principles of energy conversion and energy sources, both traditional and renewable, in a broad range of facilities such as electrical substations, boiler plants, heat and power plants, electrical networks, thermal fluid distributions lines and insulations, pumps and fans, air compressor systems, cooling plants, HVAC, lighting, and heat recovery plants. The book also examines principles of energy auditing and accounting, the correlation between energy and environment, and includes detail on the economic analysis of energy saving investment and education in the field of energy.This book also:· Explores a broad array of power generation and distribution facilities around the concept of energy conversion, from traditional and renewable sources, correlating many apparently disparate topics· Elucidates fundamental formulas and information-rich figures to help readers in solving any practical energy conversion problems· Emphasizes a holistic perspective on energy conversion and management with a vision of each application as a system beyond its individual elements · Includes a set of Key Performance Index using metrics applicable to energy systems brought into operation over the past 30 years · Gives a set of basic formulas and data that are the essentials of energy conversion and that everybody involved in these fields should perfectly know · Adopts a writing style accessible to technicians and managers in the field of energy conversion while maintaining sufficient rigor and coverage for engineers
Energy Conversion and Particle Acceleration in the Solar Corona (Lecture Notes in Physics #612)
by Karl-Ludwig Klein
Energy Conversion Efficiency of Solar Cells (Green Energy and Technology)
by Takashi Kita Yukihiro Harada Shigeo AsahiThis book offers a concise primer on energy conversion efficiency and the Shockley-Queisser limit in single p-n junction solar cells. It covers all the important fundamental physics necessary to understand the conversion efficiency, which is indispensable in studying, investigating, analyzing, and designing solar cells in practice. As such it is valuable as a supplementary text for courses on photovoltaics, and bridges the gap between advanced topics in solar cell device engineering and the fundamental physics covered in undergraduate courses. The book first introduces the principles and features of solar cells compared to those of chemical batteries, and reviews photons, statistics and radiation as the physics of the source energy. Based on these foundations, it clarifies the conversion efficiency of a single p-n junction solar cell and discusses the Shockley-Queisser limit. Furthermore, it looks into various concepts of solar cells for breaking through the efficiency limit given in the single junction solar cell and presents feasible theoretical predictions. To round out readers’ knowledge of p-n junctions, the final chapter also reviews the essential semiconductor physics. The foundation of solar cell physics and engineering provided here is a valuable resource for readers with no background in solar cells, such as upper undergraduate and master students. At the same time, the deep insights provided allow readers to step seamlessly into other advanced books and their own research topics.
Energy Conversion in Natural and Artificial Photosynthesis (Springer Series in Chemical Physics #117)
by Katharina BrinkertThis book discusses the basic principles and processes of solar energy conversion in natural photosynthesis. It then directly compares them with recent developments and concepts currently being pursued in artificial photosynthetic systems that are capable of utilizing sunlight to convert carbon dioxide and water into a chemical fuel. In this regard, the main focus is on photoelectrochemical cells, in which semiconducting photoanodes and -cathodes modified with (electro-) catalysts are used to oxidize water, produce hydrogen and reduce carbon dioxide in a monolithic device. The fundamental photochemical and photophysical processes involved are presented and discussed, along with protection mechanisms and efficiency calculations for both natural and artificial photosynthesis. In turn, key parameters that are crucial for the efficient operation of natural photosynthesis are identified. Lastly, their validity and applicability in the design of artificial solar-driven water-splitting systems are examined.
Energy Cooperation in South Asia: Utilizing Natural Resources for Peace and Sustainable Development (Routledge Explorations in Energy Studies)
by Mirza Sadaqat HudaThis book analyses the key political challenges to regional energy cooperation in South Asia. It argues that investment in the planning of regional energy projects can increase their viability and also drive integration and peacebuilding. Regional cooperation has been substantiated by academics and multilateral development banks as one of the most viable solutions to South Asia’s crippling energy crisis. However, three decades of national and regional efforts have failed to develop a single multilateral energy project or foster high levels of bilateral cooperation. Using data collected through extensive interviews with policymakers in India, Bangladesh, Pakistan and Nepal, this book identifies the specific roadblocks to energy cooperation – including domestic politics and the failure of leadership on multiple levels - and evaluates how these political challenges determine regional interactions on energy securitisation, environmental cooperation and human rights. Huda then undertakes case studies on four transnational energy projects to highlight specific policy recommendations to overcome these challenges, suggesting planning mechanisms through which the significant issue of energy cooperation in South Asia can be addressed. This book will be of great interest to students and scholars of energy security and geopolitics, natural resource governance and South Asian politics.
Energy Cooperation in South Asia: Utilizing Natural Resources for Peace and Sustainable Development (Routledge Explorations in Energy Studies)
by Mirza Sadaqat HudaThis book analyses the key political challenges to regional energy cooperation in South Asia. It argues that investment in the planning of regional energy projects can increase their viability and also drive integration and peacebuilding. Regional cooperation has been substantiated by academics and multilateral development banks as one of the most viable solutions to South Asia’s crippling energy crisis. However, three decades of national and regional efforts have failed to develop a single multilateral energy project or foster high levels of bilateral cooperation. Using data collected through extensive interviews with policymakers in India, Bangladesh, Pakistan and Nepal, this book identifies the specific roadblocks to energy cooperation – including domestic politics and the failure of leadership on multiple levels - and evaluates how these political challenges determine regional interactions on energy securitisation, environmental cooperation and human rights. Huda then undertakes case studies on four transnational energy projects to highlight specific policy recommendations to overcome these challenges, suggesting planning mechanisms through which the significant issue of energy cooperation in South Asia can be addressed. This book will be of great interest to students and scholars of energy security and geopolitics, natural resource governance and South Asian politics.
Energy Costs and Farm Characteristics in the European Union: Highlighting Linkages with Structural and Policy Dimensions (SpringerBriefs in Applied Sciences and Technology)
by Vítor João MartinhoThis book explores the relationships between the energy costs and other farm variables in the European Union (including the UK) over a recent period of six years. It examines labour, farm land area, outputs/inputs, investments, assets, taxes, and subsidies in the context of policy measures and the farm structure. The book provides a deep insight into how energy cost and other factors in the farming sector relate to each other and as a result how farm planning can be made more efficient, more environmentally sustainable and more competitive. It will be of interest to policy-makers, governments, researchers and advanced students of economics, policy and the environment.
Energy Culture: Work, Power, and Waste in Russia and the Soviet Union (Literatures, Cultures, and the Environment)
by Jillian Porter Maya VinokourThis volume investigates energy as a shaping force in Russian and Soviet literature, visual culture, and social practice. Chronologically arranged chapters explain how nineteenth-century ideas about energy informed realist novels and paintings; how the poetics of energy defined pre-Revolutionary and Stalinist utopianism; and how fossil fuels, electricity, and nuclear fission generated distinct aesthetic features in Imperial Russian, Soviet, and post-Soviet literature, cinema, and landscape. The volume’s concentration on Russia responds to a clear need to understand the role the country plays in social, political, and economic processes endangering life on Earth today. The cultural dimension of Russia’s efforts at energy dominance deserves increased scholarly attention not only in its own right, but also because it directly affects global energy policy. As the contributors to this volume argue, the nationally inflected cultural myths that underlie human engagements with energy have been highly consequential in the Anthropocene.
Energy Demand and Climate Change: Issues and Resolutions
by Franklin Hadley CocksThis scientifically sound, yet easily readable book provides the fundamentals necessary to understand today's energy and climate problems and provides possible answers based on current technology such as solar, water and geothermal power. Moreover, it introduces the reader to new concepts that are already or may soon be realized, such as nuclear fusion or a hydrogen-based economy. Aimed at a wide readership ranging from educated laypeople and students to practitioners in engineering and environmental science.
Energy Demand and Climate Change: Issues and Resolutions
by Franklin Hadley CocksThis scientifically sound, yet easily readable book provides the fundamentals necessary to understand today's energy and climate problems and provides possible answers based on current technology such as solar, water and geothermal power. Moreover, it introduces the reader to new concepts that are already or may soon be realized, such as nuclear fusion or a hydrogen-based economy. Aimed at a wide readership ranging from educated laypeople and students to practitioners in engineering and environmental science.