Biotic invaders are species that establish a new range in which they proliferate, spread, and persist to the detriment of the environment. They are the most important ecological outcomes from the unprecedented alterations in the distribution of the earth's biota brought about largely through human transport and commerce. In a world without borders, few if any areas remain sheltered from these im- migrations. The fate of immigrants is decidedly mixed. Few survive the hazards of chronic and stochastic forces, and only a small fraction become naturalized. In turn, some naturalized species do become invasive. There are several potential reasons why some immigrant species prosper: some escape from the constraints of their native predators or parasites; others are aided by human-caused disturbance that disrupts native communities. Ironically, many biotic invasions are apparently facilitated by cultivation and husbandry, unintentional actions that foster immigrant populations until they are self-perpetuating and uncontrollable. Whatever the cause, biotic invaders can in many cases inflict enormous environmental damage: (1) Animal invaders can cause extinctions of vulnerable native species through predation, grazing, competition, and habitat alteration. (2) Plant invaders can completely alter the fire regime, nutrient cycling, hydrology, and energy budgets in a native ecosystem and can greatly diminish the abundance or survival of native species. (3) In agriculture, the principal pests of temperate crops are nonindigenous, and the combined expenses of pest control and crop losses constitute an onerous "tax" on food, fiber, and forage production. (4) The global cost of virulent plant and animal diseases caused by parasites transported to new ranges and presented with susceptible new hosts is currently incalculable. Identifying future invaders and taking effective steps to prevent their dispersal and establishment con- stitutes an enormous challenge to both conservation and international commerce. Detection and management when exclusion fails have proved daunting for varied reasons: (1) Efforts to identify general attributes of future invaders have often been inconclusive. (2) Predicting susceptible locales for future invasions seems even more problematic, given the enormous differences in the rates of arrival among potential invaders. (3) Eradication of an established invader is rare, and control efforts vary enormously in their efficacy. Successful control, however, depends more on commitment and continuing diligence than on the efficacy of specific tools themselves. (4) Control of biotic invasions is most effective when it employs a long-term, ecosystem- wide strategy rather than a tactical approach focused on battling individual invaders. (5) Prevention of invasions is much less costly than post-entry control. Revamping national and international quarantine laws by adopting a "guilty until proven innocent" approach would be a productive first step. Failure to address the issue of biotic invasions could effectively result in severe global consequences, including wholesale loss of agricultural, forestry, and fishery resources in some regions, disruption of the ecological processes that supply natural services on which human enterprise depends, and the creation of homogeneous, impoverished ecosystems composed of cosmopolitan species. Given their current scale, biotic invasions have taken their place alongside human-driven atmospheric and oceanic alterations as major agents of global change. Left unchecked, they will influence these other forces in profound but still unpredictable ways.

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Biotic invasions: causes, epidemiology, global consequences, and control

Modern management theory is constricted by a fractured epistemology. which separates humanity from nature and truth from morality. Reintegration is necessary if organizational science is to support ecologically and socially sustainable development. This article posits requisites of such development and rejects the paradigms of conventional technocentrism and antithetical ecocentrism on grounds of incongruence. A more fruitful integrative paradigm of “sustaincentrism” is then articulated, and implications for organizational science are generated as if sustainability, extended community, and our Academy mattered.

http://ingenieroambiental.com/inf/elparagigmadeldesarrollosustentable.PDF

Shifting Paradigms for Sustainable Development: Implications for Management Theory and Research

Sustainable development: a critical review

We developed a stochastic version of the Impact = Population·Affluence·Technology (IPAT) model to estimate the effects of population, affluence, and technology on national CO2 emissions. Our results suggest that, for population, there are diseconomies of scale for the largest nations that are not consistent with the assumption of direct proportionality (log–linear effects) common to most previous research. In contrast, the effects of affluence on CO2 emissions appear to reach a maximum at about $10,000 in per- capita gross domestic product and to decline at higher levels of affluence. These results confirm the general value of the IPAT model as a starting point for understanding the anthropogenic driving forces of global change and suggest that population and economic growth anticipated over the next decade will exacerbate greenhouse gas emissions.

https://www.pnas.org/content/pnas/94/1/175.full.pdf

Effects of population and affluence on CO2 emissions

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Economics of natural resources and the environment

Humanity's Current Dilemma The Global Ecosystem and the Economic Subsystem From Localized Limits to Global Limits Population and Poverty Beyond Brundtland Toward Sustainability The Fragmentation of Economics and the Natural Sciences The Historical Development of Economics and Ecology Early Codevelopment of Economics and Natural Science Economics and Ecology Specialize and Separate Reintegration of Ecology and Economics Conclusions Principles and Objectives of Ecological Economics Sustainable Scale, Fair Distribution, and Efficient Allocation Ecosystems, Biodiversity, and Ecosystem Services Substitutability versus Complementarity of Natural, Human, Social, and Built Capital Population and Carrying Capacity Measuring Welfare and Well-Being Valuation, Choice, and Uncertainty Trade and Community Institutions, Instruments, and Policies History of Environmental Institutions and Instruments The Need to Develop a Shared Vision of a Sustainable Society Successes, Failures, and Remedies Policy Instruments: Some Background Examples of Policies, Instruments, and Institutions Governance Conclusions and Prospects for the Future References Index

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An Introduction to Ecological Economics

After deploring the mystification of the term sustainability and tendencies to conflate it with society's desiderata, we desegregate three types of sustainability: social, economic, and environmental. After clarifying these three linked and overlapping concepts, and construing them with sustainable development, we distinguish quantitative throughput growth from qualitative development, and mention intergenerational equity and scarcity of natural capital that together lead to the definition of environmental sustainability by the output/input rule, i.e., keep wastes within assimilative capacities; harvest within regenerative capacities of renewable resources; deplete non-renewables at the rate at which renewable substitutes are developed. After distinguishing development from sustainability and from growth, the paper describes the concept of natural capital and uses the concept to present four alternative definitions of environmental sustainability. Next, the paper presents criteria for analyzing environmental sustainability and uses the Ehrlich-Holdren framework in which Population," Pffluence, and Technology are examined separately. The paper then nuances the I = PAT identity and starts to disaggregate the components of sustainability into more dynamic formulations. The final section describes how one large development agency, the World Bank, is endeavoring to incorporate these new principles into its operations.

Robert Goodland

Papers

An Introduction to Ecological Economics

Environmental Sustainability: Universal and Non-Negotiable

Neoclassical economics and principles of sustainable development

Environmental sustainability in agriculture: diet matters

An ecological-economic assessment of deregulation of international commerce under GATT