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Encyclopedia of Global Warming and Climate Change, Second Edition
by Dr George PhilanderThe First Edition of the Encyclopedia of Global Warming and Climate Change provided a multi-authored, academic yet non-technical resource for students and teachers to understand the importance of global warming, to appreciate the effects of human activity and greenhouse gases around the world, and to learn the history of climate change and the research enterprise examining it. This edition was well received, with notable reviews. Since its publication, the debate over the advent of global warming at least partially brought on by human enterprise has continued to ebb and flow, depending literally on the weather, politics, and media coverage of climate summits and debates. Advances in research also change the discourse as new data is collected and new scientific projects continue to explore and explain global warming and climate change. Thus, a new, Second Edition updates more than half of the original entries and adds new perspectives and content to keep students and researchers up-to-date in a field that has proven provocatively lively.
Encyclopedia of Lakes and Reservoirs
by Lars Bengtsson Rhodes W. Fairbridge Reginald W. HerschyLakes and reservoirs hold about 90% of the world's surface fresh water, but overuse, water withdrawal and pollution of these bodies puts some one billion people at risk. The Encyclopedia of Lakes and Reservoirs reviews the physical, chemical and ecological characteristics of lakes and reservoirs, and describes their uses and environmental state trends in different parts of the world. Superbly illustrated throughout, it includes some 200 entries in a range of topics, including acidification, artificialisation, canals, climate change effects, dams, dew ponds, drainage, eutrofication, evaporation, fisheries, hydro-electric power, nutrients, organic pollution, paleolimnology, reservoir capacities and depths, sedimentation, water resources and more.
Encyclopedia of Lunar Science
by Brian CudnikThe Encyclopedia of Lunar Science includes the latest topical data, definitions, and explanations of the many and varied facets of lunar science. This is a very useful reference work for a broad audience, not limited to the professional lunar scientist: general astronomers, researchers, theoreticians, practitioners, graduate students, undergraduate students, and astrophysicists as well as geologists and engineers. The title includes all current areas of lunar science, with the topical entries being established tertiary literature. The work is technically suitable to most advanced undergraduate and graduate students. The articles include topics of varying technical levels so that the top scientists of the field find this work a benefit as well as the graduate students and the budding lunar scientists. A few examples of topical areas are as follows: Basaltic Volcanism, Lunar Chemistry, Time and Motion Coordinates, Cosmic Weathering through Meteoritic Impact, Environment, Geology, Geologic History, Impacts and Impact Processes, Lunar Surface Processes, Origin and Evolution Theories, Regolith, Stratigraphy, Tectonic Activity, Topography, Weathering through ionizing radiation from the solar wind, solar flares, and cosmic rays.
Encyclopedia of Marine Geosciences
by Jan Harff Martin Meschede Sven Petersen Jörn ThiedeGlobally growing demand of energy and mineral resources, reliable future projection of climate processes and the protection of coasts to mitigate the threats of disasters and hazards require a comprehensive understanding of the structure, ongoing processes and genesis of the marine geosphere. Beyond the "classical" research fields in marine geology in current time more general concepts have been evolved integrating marine geophysics, hydrography, marine biology, climatology and ecology. As an umbrella the term "marine geosciences" has been broadly accepted for this new complex field of research and the solutions of practical tasks in the marine realm. The "Encyclopedia of Marine Geosciences" comprises the current knowledge in marine geosciences whereby not only basic but also applied and technical sciences are covered. Through this concept a broad scale of users in the field of marine sciences and techniques is addressed from students and scholars in academia to engineers and decision makers in industry and politics.
Encyclopedia of Mineral and Energy Policy
by Günter Tiess Tapan Majumder Peter CameronThis Encyclopedia provides a cutting-edge, up-to-date reference source on mineral and energy policies around the world. It offers information on GDP, population, investment scenarios and current environmental regulations in over one hundred thirty countries from 13 geographic regions around the world. It covers topics such as geo-conservation, deep mining technology as well as rare earth, green technology and international organizations that are actively involved in minerals and energy through exploration, arbitration, marketing and investment. Topical entries are presented alphabetically with extensive cross-referencing to ensure user-friendly reading. This Encyclopedia presents the work of more than 20 section editors and more than 100 international experts in the fields of mineral and energy policies. It is designed as a essential resource for researchers, students, libraries, industry, governments, and international organizations and presents a wealth of insights and guidance for corporate planning regarding exploration and financial investments, as well as for venture capitalist and international funding bodies. As such, it provides an indispensable point of reference for future research on mineral and energy policy.
Encyclopedia of Modern Coral Reefs
by Colin Woodroffe David Hopley Eberhard Gischler Guy Cabioch † I. G. Macintyre Peter Davies Rachel Wood Terry DoneCoral reefs are the largest landforms built by plants and animals. Their study therefore incorporates a wide range of disciplines. This encyclopedia approaches coral reefs from an earth science perspective, concentrating especially on modern reefs. Currently coral reefs are under high stress, most prominently from climate change with changes to water temperature, sea level and ocean acidification particularly damaging. Modern reefs have evolved through the massive environmental changes of the Quaternary with long periods of exposure during glacially lowered sea level periods and short periods of interglacial growth. The entries in this encyclopedia condense the large amount of work carried out since Charles Darwin first attempted to understand reef evolution. Leading authorities from many countries have contributed to the entries covering areas of geology, geography and ecology, providing comprehensive access to the most up-to-date research on the structure, form and processes operating on Quaternary coral reefs.
Encyclopedia of Natural Hazards
by Peter T. Bobrowsky Paul Slovic Tom Beer Norm Catto Bill Mcguire Pedro Basabe Viacheslav Gusiakov Philipp Schmidt-Thomé H. Jay Melosh Farrokh NadimFew subjects have caught the attention of the entire world as much as those dealing with natural hazards. The first decade of this new millennium provides a litany of tragic examples of various hazards that turned into disasters affecting millions of individuals around the globe. The human losses (some 225,000 people) associated with the 2004 Indian Ocean earthquake and tsunami, the economic costs (approximately 200 billion USD) of the 2011 Tohoku Japan earthquake, tsunami and reactor event, and the collective social impacts of human tragedies experienced during Hurricane Katrina in 2005 all provide repetitive reminders that we humans are temporary guests occupying a very active and angry planet. Any examples may have been cited here to stress the point that natural events on Earth may, and often do, lead to disasters and catastrophes when humans place themselves into situations of high risk. Few subjects share the true interdisciplinary dependency that characterizes the field of natural hazards. From geology and geophysics to engineering and emergency response to social psychology and economics, the study of natural hazards draws input from an impressive suite of unique and previously independent specializations. Natural hazards provide a common platform to reduce disciplinary boundaries and facilitate a beneficial synergy in the provision of timely and useful information and action on this critical subject matter. As social norms change regarding the concept of acceptable risk and human migration leads to an explosion in the number of megacities, coastal over-crowding and unmanaged habitation in precarious environments such as mountainous slopes, the vulnerability of people and their susceptibility to natural hazards increases dramatically. Coupled with the concerns of changing climates, escalating recovery costs, a growing divergence between more developed and less developed countries, the subject of natural hazards remains on the forefront of issues that affect all people, nations, and environments all the time. This treatise provides a compendium of critical, timely and very detailed information and essential facts regarding the basic attributes of natural hazards and concomitant disasters. The Encyclopedia of Natural Hazards effectively captures and integrates contributions from an international portfolio of almost 300 specialists whose range of expertise addresses over 330 topics pertinent to the field of natural hazards. Disciplinary barriers are overcome in this comprehensive treatment of the subject matter. Clear illustrations and numerous color images enhance the primary aim to communicate and educate. The inclusion of a series of unique "classic case study" events interspersed throughout the volume provides tangible examples linking concepts, issues, outcomes and solutions. These case studies illustrate different but notable recent, historic and prehistoric events that have shaped the world as we now know it. They provide excellent focal points linking the remaining terms in the volume to the primary field of study. This Encyclopedia of Natural Hazards will remain a standard reference of choice for many years.
Encyclopedia of Nonlinear Science
by Alwyn ScottIn 438 alphabetically-arranged essays, this work provides a useful overview of the core mathematical background for nonlinear science, as well as its applications to key problems in ecology and biological systems, chemical reaction-diffusion problems, geophysics, economics, electrical and mechanical oscillations in engineering systems, lasers and nonlinear optics, fluid mechanics and turbulence, and condensed matter physics, among others.
Encyclopedia of Scientific Dating Methods
by W. Jack Rink Jeroen W. ThompsonThe most comprehensive survey of dating methods in the earth sciences, this book provides a synthesis of physical and chemical bases of dating methods, and the applications of dating methods to the geological sciences, biology, and archaeology.
Encyclopedia of Snow, Ice and Glaciers
by Helgi Björnsson Johannes Oerlemans John F. Shroder Martyn Tranter Michael P. Bishop Pratap Singh Umesh K. Haritashya Vijay P. Singh Wilfried HaeberliThe earth's cryosphere, which includes snow, glaciers, ice caps, ice sheets, ice shelves, sea ice, river and lake ice, and permafrost, contains about 75% of the earth's fresh water. It exists at almost all latitudes, from the tropics to the poles, and plays a vital role in controlling the global climate system. It also provides direct visible evidence of the effect of climate change, and, therefore, requires proper understanding of its complex dynamics. This encyclopedia mainly focuses on the various aspects of snow, ice and glaciers, but also covers other cryospheric branches, and provides up-to-date information and basic concepts on relevant topics. It includes alphabetically arranged and professionally written, comprehensive and authoritative academic articles by well-known international experts in individual fields. The encyclopedia contains a broad spectrum of topics, ranging from the atmospheric processes responsible for snow formation; transformation of snow to ice and changes in their properties; classification of ice and glaciers and their worldwide distribution; glaciation and ice ages; glacier dynamics; glacier surface and subsurface characteristics; geomorphic processes and landscape formation; hydrology and sedimentary systems; permafrost degradation; hazards caused by cryospheric changes; and trends of glacier retreat on the global scale along with the impact of climate change. This book can serve as a source of reference at the undergraduate and graduate level and help to better understand snow, ice and glaciers. It will also be an indispensable tool containing specialized literature for geologists, geographers, climatologists, hydrologists, and water resources engineers; as well as for those who are engaged in the practice of agricultural and civil engineering, earth sciences, environmental sciences and engineering, ecosystem management, and other relevant subjects.
Encyclopedia of Soil Science
by Rattan LalNew and Improved Global Edition: Three-Volume Set A ready reference addressing a multitude of soil and soil management concerns, the highly anticipated and widely expanded third edition of Encyclopedia of Soil Science now spans three volumes and covers ground on a global scale. A definitive guide designed for both coursework and self-study, this latest version describes every branch of soil science and delves into trans-disciplinary issues that focus on inter-connectivity or the nexus approach. For Soil Scientists, Crop Scientists, Plant Scientists and More A host of contributors from around the world weigh in on underlying themes relevant to natural and agricultural ecosystems. Factoring in a rapidly changing climate and a vastly growing population, they sound off on topics that include soil degradation, climate change, soil carbon sequestration, food and nutritional security, hidden hunger, water quality, non-point source pollution, micronutrients, and elemental transformations. New in the Third Edition: Contains over 600 entries Offers global geographical and thematic coverage Entries peer reviewed by subject experts Addresses current issues of global significance Encyclopedia of Soil Science, Third Edition: Three Volume Set expertly explains the science of soil and describes the material in terms that are easily accessible to researchers, students, academicians, policy makers, and laymen alike. Also Available OnlineThis Taylor & Francis encyclopedia is also available through online subscription, offering a variety of extra benefits for researchers, students, and librarians, including: Citation tracking and alerts Active reference linking Saved searches and marked lists HTML and PDF format options Contact Taylor and Francis for more information or to inquire about subscription options and print/online combination packages.US: (Tel) 1.888.318.2367; (E-mail) e-reference@taylorandfrancis.comInternational: (Tel) +44 (0) 20 7017 6062; (E-mail) online.sales@tandf.co.uk
Encyclopedia of Solid Earth Geophysics
by Ajay Manglik Anny Cazenave Eric Robert Engdahl Harsh K. Gupta Kalachand Sain Kusumita Arora Rainer Kind Seiya Uyeda Sukanta RoyThe past few decades have witnessed the growth of the Earth Sciences in the pursuit of knowledge and understanding of the planet that we live on. This development addresses the challenging endeavor to enrich human lives with the bounties of Nature as well as to preserve the planet for the generations to come. Solid Earth Geophysics aspires to define and quantify the internal structure and processes of the Earth in terms of the principles of physics and forms the intrinsic framework, which other allied disciplines utilize for more specific investigations. The first edition of the Encyclopedia of Solid Earth Geophysics was published in 1989 by Van Nostrand Reinhold publishing company. More than two decades later, this new volume, edited by Prof. Harsh K. Gupta, represents a thoroughly revised and expanded reference work. It brings together more than 200 articles covering established and new concepts of Geophysics across the various sub-disciplines such as Gravity, Geodesy, Geomagnetism, Seismology, Seismics, Deep Earth Processes, Plate Tectonics, Thermal Domains, Computational Methods, etc. in a systematic and consistent format and standard. It is an authoritative and current reference source with extraordinary width of scope. It draws its unique strength from the expert contributions of editors and authors across the globe. It is designed to serve as a valuable and cherished source of information for current and future generations of professionals.
Encyclopedia of the Antarctic
by Beau RiffenburghThe Antarctic is unique, geographically, politically, and scientifically. It is the most remote, hostile, and dangerous continent, while at the same time it is the most pristine and least developed. Antarctica is the only major part of the Earth's landmass not directly governed by one nation, but under the control of a Treaty, with a multitude of acceding nations. The Encyclopedia of the Antarctic brings together large quantities of information on the wide variety of factors, issues and individuals influencing and relating to the Antarctic. No comparable book currently exists for this region.The Encyclopedia of the Antarctic discusses scientific activities and topics, but the 'human element' is also a significant part of the work, with entries on history, politics, legal issues, national research programs, scientific bases, historic huts, the United Nation's 'Question of Antarctica,' compliance with the Environmental Protocol, and tourism.
Encyclopedia of the Arctic
by Mark NuttallWith detailed essays on the Arctic's environment, wildlife, climate, history, exploration, resources, economics, politics, indigenous cultures and languages, conservation initiatives and more, this Encyclopedia is the only major work and comprehensive reference on this vast, complex, changing, and increasingly important part of the globe. Including 305 maps.This Encyclopedia is not only an interdisciplinary work of reference for all those involved in teaching or researching Arctic issues, but a fascinating and comprehensive resource for residents of the Arctic, and all those concerned with global environmental issues, sustainability, science, and human interactions with the environment.
Encyclopedia of the City
by Roger W. CavesThe Encyclopedia of the City focuses on the key topics encountered by undergraduates and scholars in urban studies and allied fields. Contributors include major theoreticians and practitioners, and on other individuals, groups, and organizations which study the city or practice in a field that directly or indirectly affects the city, the Encyclopedia necessarily adopts an interdisciplinary and multidisciplinary perspective. A solid but also provocative starting point for wider exploration of the city, this is a first-class work of reference that will be an essential resource for independent study as well as a useful aid in teaching.
Encyclopedia of the World's Coastal Landforms
by Eric BirdThis unique richly-illustrated account of the landforms and geology of the world's coasts, presented in a country-by-country (state-by-state) sequence, assembles a vast amount of data and images of an endangered and increasingly populated and developed landform. An international panel of 138 coastal experts provides information on "what is where" on each sector of coast, together with explanations of the landforms, their evolution and the changes taking place on them. As well as providing details on the coastal features of each country (state or county) the compendium can be used to determine the extent of particular features along the world's coasts and to investigate comparisons and contrasts between various world regions. With more than 1440 color illustrations and photos, it is particularly useful as a source of information prior to researching or just visiting a sector of coast. References are provided to the current literature on coastal evolution and coastline changes.
Encyclopedia of Theoretical Ecology
by Louis Gross Alan HastingsThis major reference is an overview of the current state of theoretical ecology through a series of topical entries centered on both ecological and statistical themes. Coverage ranges across scales--from the physiological, to populations, landscapes, and ecosystems. Entries provide an introduction to broad fields such as Applied Ecology, Behavioral Ecology, Computational Ecology, Ecosystem Ecology, Epidemiology and Epidemic Modeling, Population Ecology, Spatial Ecology and Statistics in Ecology. Others provide greater specificity and depth, including discussions on the Allee effect, ordinary differential equations, and ecosystem services. Descriptions of modern statistical and modeling approaches and how they contributed to advances in theoretical ecology are also included. Succinct, uncompromising, and authoritative--a "must have" for those interested in the use of theory in the ecological sciences.
Encyclopedia of Tourism
by Jafar JafariIn fewer than three hundred years tourism has become a global service industry of great economic, cultural and political importance. Published to critical acclaim, the Encyclopedia of Tourism - now available as a Routledge World Reference title - is the definitive one-volume reference source to this challenging multisectoral industry and multi disciplinary field of study. Comprising over one thousand entries, this volume has been written by an international team of contributors to provide a comprehensive guide to both the manifest and hidden dimensions of tourism. It explores the wide range of definitions, concepts, perspectives and institutions and includes: comprehensive coverage of key issues and concepts definitions of all terms and acronyms entries on the significant institutions, associations and journals in the field country-specific tourism profiles, from Greece to Japan and Kenya to Peru thorough analysis of the trends and patterns of tourism development and growth. The extensive cross-referencing and comprehensive index will assist the reader in making links between the diverse aspects of tourism studies, and the suggestions for further reading are invaluable.
Encyclopedic Atlas of Terrestrial Impact Craters
by Enrico Flamini Mario Di Martino Alessandro ColettaThis comprehensive atlas explains the genesis and evolution of impact known craters on Earth, presenting a wealth of radar images from the Italian COSMO-SkyMed satellites that were acquired at the same frequency, spatial resolution, operating mode, and illumination, allowing excellent comparison of different impact structures. It also discusses in detail the processes that have hidden or erased terrestrial impact craters, and clearly explains the basic principles of remote sensing and the COSMO-SkyMed system and radar instruments. Also, the optical satellite remote sensing technique used to produce the optical images is described. The main section documents each of the exposed craters officially recognized as caused by meteoritic impact, presenting a table with the COSMO-SkyMed radar image and, where available, a Sentinel optical image and a photograph taken in situ. A short accompanying text reports the location, context, geographical coordinates, and other ancillary information to support future researches.
The End: 50 Apocalyptic Visions From Pop Culture That You Should Know About...Before It's Too Late
by Laura BarcellaPeople have been making predictions about how and when the world is going to end for ages. The End is a fun pop culture read about the top 50 movies, books, songs, and artworks—from the movie Shaun of the Dead to the song It's the End of the World as We Know It—about the apocalypse. Each item includes: - A synopsis of the apocalyptic work - Information about the apocalyptic theory behind it (from alien invasion to meteors, nuclear war, and natural disasters) - An explanation about why this work is important in pop culture Love doomsday talk and the art made about it? Check out this fun and entertaining read!
The End of Automobile Dependence
by Peter Newman Jeffrey KenworthyCities will continue to accommodate the automobile, but when cities are built around them, the quality of human and natural life declines. Current trends show great promise for future urban mobility systems that enable freedom and connection, but not dependence. We are experiencing the phenomenon of peak car use in many global cities at the same time that urban rail is thriving, central cities are revitalizing, and suburban sprawl is reversing. Walking and cycling are growing in many cities, along with ubiquitous bike sharing schemes, which have contributed to new investment and vitality in central cities including Melbourne, Seattle, Chicago, and New York. We are thus in a new era that has come much faster than global transportation experts Peter Newman and Jeffrey Kenworthy had predicted: the end of automobile dependence. In The End of Automobile Dependence, Newman and Kenworthy look at how we can accelerate a planning approach to designing urban environments that can function reliably and conveniently on alternative modes, with a refined and more civilized automobile playing a very much reduced and manageable role in urban transportation. The authors examine the rise and fall of automobile dependence using updated data on 44 global cities to better understand how to facilitate and guide cities to the most productive and sustainable outcomes. This is the final volume in a trilogy by Newman and Kenworthy on automobile dependence (Cities and Automobile Dependence in 1989 and Sustainability and Cities: Overcoming Automobile Dependence in 1999). Like all good trilogies this one shows the rise of an empire, in this case that of the automobile, the peak of its power, and the decline of that empire.
The End of Desertification?
by Roy Behnke Michael MortimoreThe question in the title of this book draws attention to the shortcomings of a concept that has become a political tool of global importance even as the scientific basis for its use grows weaker. The concept of desertification, it can be argued, has ceased to be analytically useful and distorts our understanding of social-environmental systems and their resiliency, particularly in poor countries with variable rainfall and persistent poverty. For better policy and governance, we need to reconsider the scientific justification for international attempts to combat desertification. Our exploration of these issues begins in the Sahel of West Africa, where a series of severe droughts at the end of the 20th century led to the global institutionalization of the idea of desertification. It now seems incontrovertible that these droughts were not caused primarily by local land use mismanagement, effectively terminating a long-standing policy and scientific debate. There is now an opportunity to treat this episode as an object lesson in the relationship between science, the formation of public opinion and international policy-making. Looking beyond the Sahel, the chapters in this book provide case studies from around the world that examine the use and relevance of the desertification concept. Despite an increasingly sophisticated understanding of dryland environments and societies, the uses now being made of the desertification concept in parts of Asia exhibit many of the shortcomings of earlier work done in Africa. It took scientists more than three decades to transform a perceived desertification crisis in the Sahel into a non-event. This book is an effort to critically examine that experience and accelerate the learning process in other parts of the world.
The End of Doom: Environmental Renewal in the Twenty-first Century
by Ronald BaileyIn the past five decades there have been many, many forecasts of impending environmental doom. They have universally been proven wrong. Meanwhile, those who have bet on human resourcefulness have almost always been correct. In his widely praised book Ecoscam, Ronald Bailey strongly countered environmentalist alarmism, using facts to demonstrate just how wildly overstated many claims of impending ecological doom really were. Now, twenty years later, the Reason Magazine science correspondent is back to assess the future of humanity and the global biosphere. Bailey finds, contrary to popular belief, that many present ecological trends are quite positive. Including: Falling cancer incidence rates in the United States. The likelihood of a declining world population by mid-century. The abundant return of agricultural land to nature as the world reaches peak farmland. A proven link between increases in national wealth and reductions in air and water pollution Global warming is a problem, but the cost of clean energy could soon fall below that of fossil fuels.In The End of Doom, Bailey avoids polemics and offers a balanced, fact-based and ultimately hopeful perspective on our current environmental situation. Now isn't that a breath of fresh air?
The End of Growth
by Richard HeinbergThis special, updated ebook edition includes new bonus material.Economists insist that recovery is at hand, yet unemployment remains high, real estate values continue to sink, and governments stagger under record deficits. The End of Growth proposes a startling diagnosis: humanity has reached a fundamental turning point in its economic history. The expansionary trajectory of industrial civilization is colliding with non-negotiable natural limits.Richard Heinberg's latest landmark work goes to the heart of the ongoing financial crisis, explaining how and why it occurred, and what we must do to avert the worst potential outcomes. Written in an engaging, highly readable style, it shows why growth is being blocked by three factors:--Resource depletion--Environmental impacts--Crushing levels of debtThese converging limits will force us to re-evaluate cherished economic theories and to reinvent money and commerce.The End of Growth describes what policy makers, communities, and families can do to build a new economy that operates within Earth's budget of energy and resources. We can thrive during the transition if we set goals that promote human and environmental well-being, rather than continuing to pursue the now-unattainable prize of ever-expanding GDP.Richard Heinberg is the author of nine previous books, including The Party's Over, Peak Everything, and Blackout. A senior fellow of the Post Carbon Institute, Heinberg is one of the world's foremost peak oil educators and an effective communicator of the urgent need to transition away from fossil fuels.
The End of Growth
by Jeff RubinIn an urgent follow-up to his best-selling Why Your World Is About To Get A Whole Lot Smaller, Jeff Rubin argues that the end of cheap oil means the end of growth. What it will be like to live in a world where growth is over? Economist and resource analyst Jeff Rubin is certain that the world's governments are getting it wrong. Instead of moving us toward economic recovery, measures being taken around the globe right now are digging us into a deeper hole. Both politicians and economists are missing the fact that the real engine of economic growth has always been cheap, abundant fuel and resources. But that era is over. The end of cheap oil, Rubin argues, signals the end of growth--and the end of easy answers to renewing prosperity. Rubin's own equation is clear: with China and India sucking up the lion's share of the world's ever more limited resources, the rest of us will have to make do with less. But is this all bad? Can less actually be more? Rubin points out that there is no research to show that people living in countries with hard-charging economies are happier, and plenty of research to show that some of the most contented people on the planet live in places with no-growth or slow-growth GDPs. But it doesn't matter whether it's bad or good, it's the new reality: our world is not only about to get smaller, our day-to-day lives are about to be a whole lot different.