Managing soils for a warming earth in a food-insecure and energy-starved world.

World energy consumption increased from 11.5 EJ in 1860 to 463 EJ in 2005, and is projected to be 691 EJ in 2030 and 850 EJ in 2050. The principal driver of such a drastic surge in energy demand is the increase in world population which was merely 1 billion in 1800, 1.6 billion in 1900, 6.0 billion in 2000, and is projected to be 7.5 billion in 2030 and 9.2 billion in 2050 before stabilizing at ≈10 billion by 2100. Heavy reliance on fossil-fuel consumption has increased atmospheric CO2 abundance from 280 ppm in 1750 to 383 ppm in 2008 and is increasing at ≈2 ppm (4.2 Pg) per year along with the attendant threat of climate disruption. Similar to the close link between energy use and atmospheric chemistry, there also exists a close link between food insecurity and climate change through degradation of soils and desertification of the ecosystems. Global annual per capita cereal consumption increased from 267 kg in 1950, peaked at 339 kg in 1985, and decreased to 303 kg by 2000. In the quest for identifying alternate sources of energy, world production of bioethanol (mostly from corn grains in USA and sugarcane in Brazil) was 65 billion L, and that of biodiesel was 13 million Mg (t) (55% in EU countries) in 2008. Conversion of lignocellulosic biomass, using crop residues or establishing energy plantations, has severe constraints of the additional requirements for land area, water, and plant nutrients. Removal of crop residues for energy and other uses has severe adverse impacts on soil quality and agronomic productivity. Yet, globally average crop yields must be increased by 60% to 120% between 2000 and 2050 for meeting the needs of increase in population and change in dietary habits. Meeting demands of the growing world population and rising aspirations necessitate serious and objective considerations of change in food habits (to a more vegan diet), improvement in energy-use efficiency, increase in crop yield per unit area and input, restoration of degraded soils and ecosystems, widespread adoption of recommended soil and crop practices, and identification of non-C fuel sources.

[1]  F. Chapin,et al.  Permafrost and the Global Carbon Budget , 2006, Science.

[2]  W. Broecker,et al.  CO2 Arithmetic , 2007, Science.

[3]  E. Davidson,et al.  Temperature sensitivity of soil carbon decomposition and feedbacks to climate change , 2006, Nature.

[4]  Clive Ponting,et al.  A New Green History of the World: The Environment and the Collapse of Great Civilizations , 1991 .

[5]  David A. Laird,et al.  The Charcoal Vision : A Win – Win – Win Scenario for Simultaneously Producing Bioenergy , Permanently Sequestering Carbon , while Improving Soil and Water Quality , 2008 .

[6]  J. Peñuelas,et al.  Responses to a Warming World , 2001, Science.

[7]  Rattan Lal,et al.  Soil Science and the Carbon Civilization , 2007 .

[8]  Lester R. Brown,et al.  Outgrowing the Earth: The Food Security Challenge in an Age of Falling Water Tables and Rising Temperatures , 2004 .

[9]  L. Zwieten,et al.  Agronomic values of greenwaste biochar as a soil amendment , 2007 .

[10]  Richard A. Kerr,et al.  Global Warming Is Changing the World , 2007, Science.

[11]  Dan Charles,et al.  Biofuels. Corn-based ethanol flunks key test. , 2009, Science.

[12]  C. Masiello,et al.  Reburial of fossil organic carbon in marine sediments , 2004, Nature.

[13]  E. Schulze Biological control of the terrestrial carbon sink , 2005 .

[14]  R. Stone China Plans $3.5 Billion GM Crops Initiative , 2008, Science.

[15]  Martial Bernoux,et al.  Soil Carbon Sequestration , 2006 .

[16]  S. Carpenter,et al.  Stability and Diversity of Ecosystems , 2007, Science.

[17]  Lew R. McCreery,et al.  Wood Energy in America , 2009, Science.

[18]  Corinne Le Quéré,et al.  Climate Change 2013: The Physical Science Basis , 2013 .

[19]  John W. Warnock,et al.  The Politics of Hunger , 1987 .

[20]  David Zilberman,et al.  Rising energy prices and the economics of water in agriculture , 2008 .

[21]  David Salt,et al.  Resilience Thinking : Sustaining Ecosystems and People in a Changing World , 2017 .

[22]  R. Horn,et al.  Pore shrinkage dependency of inorganic and organic soils on wetting and drying cycles , 2007 .

[23]  B. Soden,et al.  Atmospheric Warming and the Amplification of Precipitation Extremes , 2008, Science.

[24]  Rattan Lal,et al.  Erosion-crop productivity relationships for soils of Africa , 1995 .

[25]  D. Spracklen,et al.  Carbon Mitigation by Biofuels or by Saving and Restoring Forests? , 2007, Science.

[26]  L. Rustad From Transient to Steady-state Response of Ecosystems to Atmospheric CO2-enrichment and Global Climate Change: Conceptual Challenges and Need for an Integrated Approach , 2006, Plant Ecology.

[27]  Wood energy: predicting costs. , 2009, Science.

[28]  Tami C. Bond,et al.  Global biofuel use, 1850–2000 , 2007 .

[29]  B. Bouman,et al.  Comparison between aerobic and flooded rice in the tropics: Agronomic performance in an eight-season experiment , 2006 .

[30]  N. Borlaug Feeding a Hungry World , 2007, Science.

[31]  R. Lal Crop residues as soil amendments and feedstock for bioethanol production. , 2008, Waste management.

[32]  A. Mannion The earth as transformed by human action , 1991 .

[33]  Mark Z. Jacobson,et al.  The Short-Term Cooling but Long-Term Global Warming Due to Biomass Burning , 2004 .

[34]  Doug Allen,et al.  Driving on Biomass , 2009, Science.

[35]  Brian G. Wolff,et al.  Forecasting Agriculturally Driven Global Environmental Change , 2001, Science.

[36]  Jacinto F. Fabiosa,et al.  Use of U.S. Croplands for Biofuels Increases Greenhouse Gases Through Emissions from Land-Use Change , 2008, Science.

[37]  Corinne Le Quéré,et al.  Contributions to accelerating atmospheric CO2 growth from economic activity, carbon intensity, and efficiency of natural sinks , 2007, Proceedings of the National Academy of Sciences.

[38]  R. Kerr Hydrology. Northern India's groundwater is going, going, going ... , 2009, Science.

[39]  Rattan Lal,et al.  Biofuels from crop residues , 2007 .

[40]  L. Brown Could food shortages bring down civilization? , 2009, Scientific American.

[41]  M. Huston,et al.  The global distribution of net primary production: resolving the paradox , 2009 .

[42]  S. Devereux Why does famine persist in Africa? , 2009, Food Security.

[43]  Leo Schrattenholzer,et al.  Global bioenergy potentials through 2050 , 2001 .

[44]  W. Seifritz,et al.  Should we store carbon in charcoal , 1993 .

[45]  D. Greenland,et al.  Soil Resilience and Sustainable Land Use , 1994 .

[46]  E. A. Shneour Oxidation of Graphitic Carbon in Certain Soils , 1966, Science.

[47]  Jason W. Clay,et al.  World agriculture and the environment: a commodity-by-commodity guide to impacts and practices. , 2004 .

[48]  P. Pinstrup-Andersen,et al.  Food security: definition and measurement , 2009, Food Security.

[49]  R. Lal World crop residues production and implications of its use as a biofuel , 2005 .

[50]  B. Turner The Earth as Transformed by Human Action , 1988 .

[51]  J. Rockström,et al.  Present and future water requirements for feeding humanity , 2009, Food Security.

[52]  Winfried E. H. Blum,et al.  Long term effects of manure, charcoal and mineral fertilization on crop production and fertility on a highly weathered Central Amazonian upland soil , 2007, Plant and Soil.

[53]  T. D. Mitchell,et al.  Ecosystem Service Supply and Vulnerability to Global Change in Europe , 2005, Science.

[54]  Organic and GM—Why Not? , 2008, Science.

[55]  E. Marris Sugar cane and ethanol: Drink the best and drive the rest , 2006, Nature.

[56]  D. McDowell Foreword , 1999 .

[57]  J. Katzenberger,et al.  Nutrient Imbalances in Agricultural Development , 2009, Science.

[58]  S. Hagemann,et al.  Vulnerability of Permafrost Carbon to Climate Change: Implications for the Global Carbon Cycle , 2008 .

[59]  P. Fearnside,et al.  Amazonian Dark Earths as Carbon Stores and Sinks , 2003 .

[60]  Robert D. Perlack,et al.  Current and potential U.S. corn stover supplies. , 2007 .

[61]  Martin Jenkins,et al.  The natural fix? The role of ecosystems in climate mitigation: a UNEP rapid response assessment. , 2009 .

[62]  C. Valentin,et al.  Black carbon contribution to soil organic matter composition in tropical sloping land under slash and burn agriculture , 2006 .

[63]  J. Rockström Resilience building and water demand management for drought mitigation , 2003 .

[64]  C. Baanante,et al.  Agricultural production and soil nutrient mining in Africa: implications for resource conservation and policy development. , 2006 .

[65]  Sandra Postel,et al.  Pillar of Sand: Can the Irrigation Miracle Last? , 1999 .

[66]  S. Solomon,et al.  Irreversible climate change due to carbon dioxide emissions , 2009, Proceedings of the National Academy of Sciences.

[67]  J. Regalbuto Cellulosic Biofuels—Got Gasoline? , 2009, Science.

[68]  D. D. Onduru,et al.  Turning the tides of soil degradation in Africa: capturing the reality and exploring opportunities , 2005 .

[69]  S. Polasky,et al.  Land Clearing and the Biofuel Carbon Debt , 2008, Science.

[70]  Wallace E. Tyner,et al.  The US Ethanol and Biofuels Boom: Its Origins, Current Status, and Future Prospects , 2008 .

[71]  R. Lal,et al.  Soil Carbon Sequestration Impacts on Global Climate Change and Food Security , 2004, Science.

[72]  C. Field,et al.  Greater Transportation Energy and GHG Offsets from Bioelectricity Than Ethanol , 2009, Science.

[73]  R. Lal Ten tenets of sustainable soil management , 2009, Journal of Soil and Water Conservation.

[74]  D. Wardle,et al.  Fire-Derived Charcoal Causes Loss of Forest Humus , 2008, Science.

[75]  P. Sánchez,et al.  Soil Fertility and Hunger in Africa , 2002, Science.

[76]  C. Funk,et al.  Declining global per capita agricultural production and warming oceans threaten food security , 2009, Food Security.

[77]  E. Boyle,et al.  The global carbon cycle: a test of our knowledge of earth as a system. , 2000, Science.

[78]  Rattan Lal,et al.  The Role of Residues Management in Sustainable Agricultural Systems , 1995 .

[79]  Emma Marris,et al.  Putting the carbon back: Black is the new green , 2006, Nature.

[80]  Kenneth G. Cassman,et al.  Meeting Cereal Demand While Protecting Natural Resources and Improving Environmental Quality , 2003 .

[81]  Christopher B Field,et al.  The global potential of bioenergy on abandoned agriculture lands. , 2008, Environmental science & technology.

[82]  R. Lal Food Insecurity's Dirty Secret , 2008, Science.

[83]  D. Nowak,et al.  Carbon storage by urban soils in the United States. , 2006, Journal of environmental quality.

[84]  Wim Turkenburg,et al.  Exploration of regional and global cost–supply curves of biomass energy from short-rotation crops at abandoned cropland and rest land under four IPCC SRES land-use scenarios , 2009 .

[85]  R. Lal,et al.  The Depth Distribution of Soil Organic Carbon in Relation to Land Use and Management and the Potential of Carbon Sequestration in Subsoil Horizons , 2005 .

[86]  J. Edmonds,et al.  Implications of Limiting CO2 Concentrations for Land Use and Energy , 2009, Science.

[87]  E. Lambin,et al.  Proximate Causes and Underlying Driving Forces of Tropical Deforestation , 2002 .

[88]  P. Willems,et al.  The Biofuels Landscape Through the Lens of Industrial Chemistry , 2009, Science.

[89]  L. Lynd,et al.  Beneficial Biofuels—The Food, Energy, and Environment Trilemma , 2009, Science.

[90]  P. Abelson Improved Yields of Biomass , 1991, Science.

[91]  A. Wild Soils, Land and Food: Managing the Land during the Twenty-First Century , 2003 .

[92]  M. Schaepman,et al.  Proxy global assessment of land degradation , 2008 .

[93]  John Gaunt,et al.  Bio-char Sequestration in Terrestrial Ecosystems – A Review , 2006 .

[94]  M. Fowles Black carbon sequestration as an alternative to bioenergy , 2007 .

[95]  C. Schaefer,et al.  Pedogenesis and pre-Colombian land use of “Terra Preta Anthrosols” (“Indian black earth”) of Western Amazonia , 2002 .

[96]  L. R. Oldeman The Global Extent of Soil Degradation , 1992 .