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Drivers of Change in Ecosystem Condition and Services

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Drivers of Change in Ecosystem Condition and Services Chapter 7 Drivers of Change in Ecosystem Condition and Services Coordinating Lead Author: Gerald C. Nelson Lead Authors: Elena Bennett, Asmeret Asefaw Berhe, Kenneth G. Cassman, Ruth DeFries, Thomas Dietz, Andrew Dobson, Achim Dobermann, Anthony Janetos, Marc Levy, Diana Marco, Nebojsa Nakic´enovic´, Brian O’Neill, Richard Norgaard, Gerhard Petschel-Held, Dennis Ojima, Prabhu Pingali, Robert Watson, Monika Zurek Review Editors: Agnes Rola, Ortwin Renn, Wolfgang Weimer-Jehle Main Messages . ............................................ 175 7.1 Introduction ........................................... 175 7.2 Indirect Drivers ........................................ 176 7.2.1 Demographic Drivers 7.2.2 Economic Drivers: Consumption, Production, and Globalization 7.2.3 Sociopolitical Drivers 7.2.4 Cultural and Religious Drivers 7.2.5 Science and Technology Drivers 7.3 Direct Drivers . ........................................ 199 7.3.1 Climate Variability and Change 7.3.2 Plant Nutrient Use 7.3.3 Land Conversion 7.3.4 Biological Invasions and Diseases 7.4 Examples of Interactions among Drivers and Ecosystems ......... 212 7.4.1 Land Use Change 7.4.2 Tourism 7.5 Concluding Remarks .................................... 214 NOTES ................................................... 214 REFERENCES .............................................. 214 173 ................. 11411$ $CH7 10-27-05 08:42:07 PS PAGE 173 174 Ecosystems and Human Well-being: Scenarios BOXES 7.16 Trends in Global Consumption of Nitrogen Fertilizers, 7.1 War as a Driver of Change in Ecosystem Services and 1961–2001* Human Well-being 7.17 Trends in Maize Grain Yield, Use of Nitrogen Fertilizer, and 7.2 Drivers of Land Use Change in Central Asia Nitrogen Use Efficiency in United States, 1965–2000 7.18 Trends in Global Consumption of Phosphate Fertilizer, FIGURES 1961–2002* 7.1 Global Population Projections, 2005–2100 7.19 Phosphorus Accumulation in Agricultural Soils, 1960–95, as 7.2 MA World Population Scenarios, 2000–2100 Determined by Global Budget 7.3 Changes in Economic Structure for Selected Countries, 7.20 Estimated Inputs, Outputs, and Change in Storage of 1820–1992 Phosphorus on Agricultural Lands in Lower- and Higher- 7.4 Income Level and Distribution, 1970 and 2000 income Countries, 1961–96 7.5 Income per Person, per Capita (GNI) Average, 1999–2003* 7.21 Trends in Global Consumption of Potash Fertilizer, 7.6a Average GDP per Capita Annual Growth Rate, 1990–2003* 1961–2000 7.6b Average GDP Annual Growth Rate, 1990–2003* 7.22 An Overview of the Causative Patterns of Tropical 7.7 World Trade and GDP Growth, 1930–95 Deforestation* 7.8 World Merchandise Trade by Major Trade Groups, TABLES 1950–2001 7.1 Global Population Trends since 1950 7.9 Metals Intensity of Use per Unit of GDP (PPP) as a Function of GDP (PPP) per Capita for 13 World Regions* 7.2 Fertility, Mortality, and Migration Assumptions, by Scenario 7.10 Energy Intensity Changes with Changes in per Capita 7.3 Per Capita GDP Growth Rates for Selected Regions and Income for China, India, Japan, and United States* Time Periods 7.11 Energy Intensity Changes over Time for China, India, Japan, 7.4 Examples of Productivity Growth for the Entire Economy and and United States* for Selected Sectors and Countries 7.12 Pathways of the Ecological Impacts of Tourism on 7.5 Rate of Growth of Wheat Yield by Mega-environment, Elite Biodiversity Spring Wheat Yield Trial, 1964–95 7.13 Variations of the Earth’s Surface Temperature, 1000–2100* 7.6 Observed and Modeled Changes in Extremes of Weather 7.14 Past and Future Carbon Dioxide Concentrations* and Climate 7.15 Concentration of Greenhouse Gases* 7.7 Regional Creation of Reactive Nitrogen in the Mid-1990s *This appears in Appendix A at the end of this volume. ................. 11411$ $CH7 10-27-05 08:42:07 PS PAGE 174 Drivers of Change in Ecosystem Condition and Services 175 Main Messages Among the main direct drivers, Earth’s climate system has changed since the pre-industrial era, in part due to human activities, and is projected to A driver is any natural or human-induced factor that directly or indirectly continue to change throughout the twenty-first century. During the last causes a change in an ecosystem. A direct driver unequivocally influences 100 years, the global mean surface temperature has increased by about 0.6Њ ecosystem processes. An indirect driver operates more diffusely, by altering Celsius, precipitation patterns have changed spatially and temporally, and one or more direct drivers. Millennium Ecosystem Assessment categories of global average sea level rose 0.1–0.2 meters. The global mean surface tem- indirect drivers of change are demographic, economic, sociopolitical, scientific perature is projected to increase 1.4–5.8Њ Celsius between 1990 and 2100, and technological, and cultural and religious. Important direct drivers include accompanied by more heat waves. Precipitation patterns are projected to changes in climate, plant nutrient use, land conversion, and diseases and change, with most arid and semiarid areas becoming drier and with an in- invasive species. crease in heavy precipitation events, leading to an increased incidence in floods and drought. Global mean sea level is projected to increase by 0.05– World population, a key indirect driver, will likely peak before the end of 0.32 meters in the 1990–2050 period under the MA scenarios (0.09–0.88 the twenty-first century at less than 10 billion people. The global population meters between 1990 and 2100). growth rate peaked at 2.1% per year in the late 1960s and fell to 1.35% per year by 2000, when global population reached 6 billion. Population growth over Plant nutrient application is essential to food production, but current the next several decades is expected to be concentrated in the poorest urban methods of use contribute to environmental and socioeconomic prob- communities in sub-Saharan Africa, South Asia, and the Middle East. Popula- lems caused by greenhouse gas emissions, eutrophication, and off-farm tions in all parts of the world are expected to experience substantial aging hypoxia. Nitrogen application has increased eightfold since 1960, but 50% of during the next century. While industrial countries will have the oldest popula- the nitrogen fertilizer applied is often lost to the environment. Improvements in tions, the rate of aging could be extremely fast in some developing countries. nitrogen use efficiency require more investment in technologies that achieve greater congruence between crop nitrogen demand and nitrogen supply from Between 1950 and 2000, world GDP grew by 3.85% per year on average, all sources and that do not reduce farmer income. Phosphorus application has resulting in an average per capita income growth rate of 2.09%. In the MA increased threefold since 1960, with steady increase until 1990, followed by scenarios, per capita income grows two to four times between 2000 and 2050, leveling off at a level approximately equal to 1980s applications. These depending on scenario. Total economic output grows three to six times during changes are mirrored by phosphorus accumulation in soils, which can serve that period. With rising per capita income, the structure of consumption as an indicator of eutrophication potential for freshwater lakes and P-sensitive changes, with wide-ranging potential for effects on ecosystem condition and estuaries. services. At low incomes, demand for food quantity initially increases and then stabilizes. Food expenditures become more diverse, and consumption of in- Land cover change is a major driver of ecosystem condition and ser- dustrial goods and services rises. These consumption changes drive area vices. Deforestation and forest degradation affect 8.5% of the world’s remain- expansion for agriculture and energy and materials use. In the MA scenarios, ing forests, nearly half of which are in South America. Deforestation and forest land used for agriculture and biofuels expands from 4.9 million square kilome- degradation have been more extensive in the tropics over the past few dec- ters in 2000 to 5.3–5.9 million square kilometers in 2050. Water withdrawals ades than in the rest of the world, although data on boreal forests are espe- expand by 20–80% during the same period. cially limited, and the extent of change in this region is less well known. Approximately 10% of the drylands and hyper-arid zones of the world are In the 200 years for which reliable data exist, the overall growth of consumption considered degraded, with the majority of these areas in Asia. Cropped areas has outpaced increases in materials and energy efficiency, leading to absolute currently cover approximately 30% of Earth’s surface. In the MA scenarios, cropped areas (including pastures) increase 9–21% between 1995 and 2050. increases of materials and energy use. Human-driven movement of organisms, deliberate and accidental, is Nations with lower trade barriers, more open economies, and transparent causing a massive alteration of species ranges and contributing to government processes tend to have higher per capita income growth changes in ecosystem function. In some ecosystems, invasions by alien rates. International trade is an important source of economic gains, as it en- organisms and diseases result in the extinction of native species or a huge ables comparative advantage to be exploited and accelerates the diffusion of loss in ecosystem services. However, introductions of alien species can also more efficient technologies and practices. Where inadequate property
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