Food Miles: Environmental Protection or Veiled Protectionism?

This article examines the international trade, environmental, and development implications of campaigns to convince consumers to make food purchases based on food miles. Buying food from nearby sources has become a popular objective. One of the unmistakable messages of the “locavore” movement is that importing food – particularly food that comes from far away – causes environmental harm. The theory is that transporting food long distances results in the release of high levels of greenhouse gases (GHGs) into the atmosphere and is thus a dangerous contributor to climate change. Proponents of this view therefore argue that “food miles” – the distance food travels from farm to plate – should be kept to a minimum. The problem is that in reality, food miles are a poor proxy for environmental harm. Studies have demonstrated that differences in farming methods as well as natural factor endowments can mean that growing some products locally may in fact result in more GHG emissions than importing those same products. Notwithstanding this disconnect, legislators frequently propose policies based on food miles. Were a government to permit discrimination on the basis of food miles, or to otherwise endorse such a policy through its actions, it could be vulnerable to a World Trade Organization (WTO) dispute resolution challenge. We first explain the term “food miles”, and how the concept has been used around the world. Second, it addresses the use of food miles as an indicator of environmental harm. We argue that food miles are in fact a poor proxy of such harm, and therefore should not be used. Part III considers whether food miles labeling currently in use as well as legislation that has been proposed could be successfully challenged through a WTO dispute settlement proceeding. Our analysis includes a detailed examination of the three 2012 Appellate Body decisions addressing the TBT Agreement, US – Clove Cigarettes; US – Country of Origin Labeling (US-COOL); and US-Tuna II (Mexico), and as such will be one of the first articles to engage in such an assessment. Fourth, we address the implications for developing countries of actions taken to reduce food miles. And finally, we examine and critique alternatives to food miles for those wishing to reduce greenhouse gas emissions through farming and food consumption

Food Miles: Environmental Protection or Veiled Protectionism?

This article examines the international trade, environmental, and development implications of campaigns to convince consumers to make food purchases based on food miles. Buying food from nearby sources has become a popular objective. One of the unmistakable messages of the “locavore” movement is that importing food – particularly food that comes from far away – causes environmental harm. The theory is that transporting food long distances results in the release of high levels of greenhouse gases (GHGs) into the atmosphere and is thus a dangerous contributor to climate change. Proponents of this view therefore argue that “food miles” – the distance food travels from farm to plate – should be kept to a minimum. The problem is that in reality, food miles are a poor proxy for environmental harm. Studies have demonstrated that differences in farming methods as well as natural factor endowments can mean that growing some products locally may in fact result in more GHG emissions than importing those same products. Notwithstanding this disconnect, legislators frequently propose policies based on food miles. Were a government to permit discrimination on the basis of food miles, or to otherwise endorse such a policy through its actions, it could be vulnerable to a World Trade Organization (WTO) dispute resolution challenge. We first explain the term “food miles”, and how the concept has been used around the world. Second, it addresses the use of food miles as an indicator of environmental harm. We argue that food miles are in fact a poor proxy of such harm, and therefore should not be used. Part III considers whether food miles labeling currently in use as well as legislation that has been proposed could be successfully challenged through a WTO dispute settlement proceeding. Our analysis includes a detailed examination of the three 2012 Appellate Body decisions addressing the TBT Agreement, US – Clove Cigarettes; US – Country of Origin Labeling (US-COOL); and US-Tuna II (Mexico), and as such will be one of the first articles to engage in such an assessment. Fourth, we address the implications for developing countries of actions taken to reduce food miles. And finally, we examine and critique alternatives to food miles for those wishing to reduce greenhouse gas emissions through farming and food consumption

Production, Persistence and Diversity of Species in Temperate Grasslands

Temperate grassland areas are considered to be semi-arid, with rainfall typically between 250 and 500 mm, much of it occurring in the late spring and early summer. Grazing plays an important role in all these grasslands with impacts on diversity and persistence. Against this assumption that seasonal productivity would be more uniform within a pasture that was diverse, the research suggested that species rich pastures were less stable, because this species richness was composed of non-perennial, volunteer and weed species. This paper explores the concept that systems diversity of temperate grassland does not always equate to production. In these systems the functional role of perennial grasses is important both for the productive capacity and protection of soil through the maintenance of cover, hence represents the key element which needs to be preserved through management strategies

Food Miles: Environmental Protection or Veiled Protectionism?

Eat local. Such a small phrase yet such a loaded proposition. Buying food from nearby sources has become a popular objective. This aim is associated with helping farmers in one’s country or region; observing the seasonality of one’s location; eating fresher foods; striving for food security; and protecting the environment. One of the unmistakable messages of the “locavore” movement is that importing food—particularly food that comes from far away—causes environmental harm. The theory is that transporting food long distances results in the release of high levels of greenhouse gases (GHGs) into the atmosphere and is thus a dangerous contributor to climate change. Proponents of this view therefore argue that “food miles”—the distance food travels from farm to plate—should be kept to a minimum. Farming interests in countries that import significant amounts of agricultural products have sought regulations to differentiate between foods based on how far they have travelled. And some supermarkets, particularly in Europe, have been utilizing differential labeling, such as placing an airplane sticker on produce that has been air shipped. The overwhelming implication, then, is that the farther food travels from farm to plate, the more environmental harm is caused

Acoustic characterization of crack damage evolution in sandstone deformed under conventional and true triaxial loading

We thank the Associate Editor, Michelle Cooke, and the reviewers, Ze'ev Reches and Yves Guéguen, for useful comments which helped to improve the manuscript. We thank J.G. Van Munster for providing access to the true triaxial apparatus at KSEPL and for technical support during the experimental program. We thank R. Pricci for assistance with technical drawings of the apparatus. This work was partly funded by NERC award NE/N002938/1 and by a NERC Doctoral Studentship, which we gratefully acknowledge. Supporting data are included in a supporting information file; any additional data may be obtained from J.B. (e-mail: [email protected]).Peer reviewedPublisher PD

Estimating the Size and Structure of the Underground Commercial Sex Economy in Eight Major U.S. Cities

The underground commercial sex economy (UCSE) generates millions of dollars annually, yet investigation and data collection remain under resourced. Our study aimed to unveil the scale of the UCSE in eight major US cities. Across cities, the UCSE's worth was estimated between $39.9 and$290 million in 2007, but decreased since 2003 in all but two cities. Interviews with pimps, traffickers, sex workers, child pornographers, and law enforcement revealed the dynamics central to the underground commercial sex trade -- and shaped the policy suggestions to combat it

Fault reactivation and strain partitioning across the brittle-ductile transition

The so-called “brittle-ductile transition” is thought to be the strongest part of the lithosphere, and defines the lower limit of the seismogenic zone. It is characterized not only by a transition from localized to distributed (ductile) deformation, but also by a gradual change in microscale deformation mechanism, from microcracking to crystal plasticity. These two transitions can occur separately under different conditions. The threshold conditions bounding the transitions are expected to control how deformation is partitioned between localized fault slip and bulk ductile deformation. Here, we report results from triaxial deformation experiments on pre-faulted cores of Carrara marble over a range of confining pressures, and determine the relative partitioning of the total deformation between bulk strain and on-fault slip. We find that the transition initiates when fault strength (σ_{f}) exceeds the yield stress (σ_{y}) of the bulk rock, and terminates when it exceeds its ductile flow stress (σflow). In this domain, yield in the bulk rock occurs first, and fault slip is reactivated as a result of bulk strain hardening. The contribution of fault slip to the total deformation is proportional to the ratio (σ_{f} − σ_{y})/(σ_{flow} − σ_{y}). We propose an updated crustal strength profile extending the localized-ductile transition toward shallower regions where the strength of the crust would be limited by fault friction, but significant proportions of tectonic deformation could be accommodated simultaneously by distributed ductile flow

The Hydro-Mechanical Properties of Fracture Intersections: Pressure-Dependant Permeability and Effective Stress Law

Fluid flow through the brittle crust is primarily controlled by the capability of fracture networks to provide pathways for fluid transport. The dominant permeability orientation within fractured rock masses has been consistently correlated with the development of fracture intersections; an observation also made at the meso-regional scale. Despite the importance attributed to fracture intersections in promoting fluid flow, the magnitude of their enhancement of fractured rock permeability has not yet been quantified. Here, we characterize the hydro-mechanical properties of intersections in samples of Seljadalur Basalt by generating two orthogonal, tensile fractures produced by two separate loadings using a Brazilian test apparatus, and measuring their permeability as a function of hydrostatic pressure. We observe that intersecting fractures are significantly more permeable and less compliant than two independent macro-fractures. We formulate a model for fracture intersection permeability as a function of pressure by adding the contributions of two independent fractures plus a tube-like cavity with an effective elastic compressibility determined by its geometry. Permeability measurements during cyclic loading allowed determination of the effective stress coefficient (α in pe = pc − αpp) for fracture and intersection permeability. We observe a trend of lower αintersection values with respect to αfracture, which suggests that the channels controlling fluid flow have a higher aspect ratio (are more tubular) for the intersections relative to independent fractures. Our results suggest that fracture intersections play a critical role in maintaining permeability at depth, which has significant implications for the quantification and upscaling of fracture permeability toward reservoir-scale simulations

Influence of gouge thickness and grain size on permeability of macrofractured basalt

Fractures allow crystalline rocks to store and transport fluids, but fracture permeability can also be influenced significantly by the existence or absence of gouge and by stress history. To investigate these issues, we measured the water permeability of macrofractured basalt samples unfilled or infilled with gouge of different grain sizes and thicknesses as a function of hydrostatic stress and also under cyclic stress conditions. In all experiments, permeability decreased with increasing effective pressure, but unfilled fractures exhibited a much greater decrease than gouge-filled fractures. Macrofractures filled with fine-grained gouge had the lowest permeabilities and exhibited the smallest change with pressure. By contrast, the permeability changed significantly more in fractures filled with coarser-grained gouge. During cyclic pressurization, permeability decreased with increasing cycle number until reaching a minimum value after a certain number of cycles. Permeability reduction in unfilled fractures is accommodated by both elastic and inelastic deformation of surface asperities, while measurements of the particle size distribution and compaction in gouge-filled fractures indicate only inelastic compaction. In fine-grained gouge this is accommodated by grain rearrangement, while in coarser-grained gouge it is the result of both grain rearrangement and comminution. Overall, sample permeability is dominated by the gouge permeability, which decreases with increasing thickness and is also sensitive to the grain size and its distribution. Our results imply that there is a crossover depth in the crust below which the permeability of well-mated fractures (e.g., joints) becomes lower than that of gouge-filled fractures (e.g., shear faults)

Time Dependent Mechanical Crack Closure as a Potential Rapid Source of Post-Seismic Wave Speed Recovery: Insights From Experiments in Carrara Marble

Seismological observations indicate strong variations in wave velocities around faults both co-seismically during earthquakes, and post-seismically. Recovery is commonly associated with a reduction in crack damage. Here, we explore the recovery associated with time-dependent mechanical closure of cracks. We report results from laboratory experiments conducted on dry cores of Carrara marble at room temperature. We deformed cylindrical samples in the semi-brittle regime to induce crack damage before subjecting them to hydrostatic and triaxial stress conditions for extended periods of time while recording dilatancy and wave speeds repeatedly. We report wave speed increases of up to 40% of the damage-induced wave speed drop in samples subject to hydrostatic loading. Moreover, we report the occurrence of significant wave speed increases contemporaneously with time-dependent creep in triaxially loaded samples. Wave speed recovery during creep is only observed below a threshold creep strain rate, a result we interpret as a transition from brittle to plastic creep with decreasing strain rate. We interpret the wave speed increase in terms of reduced crack density and increased contact area within the crack array, and show that around 40% of the total crack surface has to be closed to justify the observed wave speed recoveries. We propose that mechanical crack closure is driven by the viscous relaxation of the bulk rock under the influence of locked-in stresses at low confining pressure, and of the external stresses at higher confining pressure. Our study shows that mechanical crack closure is a significant source of time-dependent wave speed recovery