Mediterranean Desertification and the Economic System

This paper reviews the role of market, population growth, social issues, developmental policies, and other (minor) economic variables contributing to Mediterranean desertification. These variables were classified as describing the micro-economic and macro-economic factors suitable to assure a better comprehension of the environmental-economic nexus. Micro-economic factors like the higher prices and lower wages in the primary sector, as well as the reduction of off-farm employment reflect some potential causes of LD. It was also argued how technical change, agricultural input prices, and household income may affect land vulnerability but their contribution to this ecological problem is poorly known. On the contrary, the role of macroeconomic factors such as population density, poverty, and environmental policies, although more extensively studied on a qualitative base, was regarded as important but still relatively ambiguous, and needs further quantitative studies. Territorial disparities in land distribution, as well as increasing rural poverty and unsustainable management of soil and water were described as a consequence of the process triggering Mediterranean desertification. The effectiveness of policies aimed at mitigating LD and thus reducing desertification risk was finally discussed.Land degradation, desertification, economic system, micro-economic causes, macro-economic factors, Mediterranean basin

‘Interrupted’ landscapes: post-earthquake reconstruction in between urban renewal and social identity of local communities

Il presente saggio vuole affrontare il tema della ricostruzione postsismica con un'attenzione alla questione del paesaggio, termine che lega in maniera indissolubile la realtà fisica del territorio a quei valori immateriali (storici, culturali, produttivi, enogastronomici, ecc.) che costituiscono l'identità dei luoghi. In questo senso si intendono “paesaggi interrotti” i luoghi distrutti dal sisma, perchè sono state interrotte le storie che legano gli abitanti al luogo, è stato interrotto quel processo di narrazione continua e di attribuzione di senso e significati che avviene tra una collettività e il suo territorio. La ricerca parte dall'analisi delle recenti ricostruzioni post-sistmiche, che hanno oscillato tra le due idee opposte di new town, poco distanti dalle città distrutte e ricostruzione “dov'era, com'era”. Il saggio indaga la dimensione sociale e semiologica del paesaggio, riflettendo sul tema dell'identità sociale, sull'attaccamento al luogo da parte degli abitanti, anche con l'obiettivo di definire linee guida e strategie progettuali per la ricostruzione sostenibile dei paesi distrutti dal sisma e da altri eventi disastrosi. In particolare vengono definite azioni di governance, strategie resilienti a partire dal coinvolgimento delle comunità locali e buone pratiche per la ricostruzione secondo un approccio paesaggistico al progetto urbano

New constraints on primordial gravitational waves from Planck 2015

We show that the new precise measurements of Cosmic Microwave Background (CMB) temperature and polarization anisotropies made by the Planck satellite significantly improves previous constraints on the cosmic gravitational waves background (CGWB) at frequencies $f>10^{-15}$ Hz. On scales smaller than the horizon at the time of decoupling, primordial gravitational waves contribute to the total radiation content of the Universe. Considering adiabatic perturbations, CGWB affects temperature and polarization CMB power spectra and matter power spectrum in a manner identical to relativistic particles. Considering the latest Planck results we constrain the CGWB energy density to $\Omega_{\rm gw} h^2 <1.7\times 10^{-6}$ at 95\% CL. Combining CMB power spectra with lensing, BAO and primordial Deuterium abundance observations, we obtain $\Omega_{\rm gw} h^2 <1.2\times 10^{-6}$ at 95\% CL, improving previous Planck bounds by a factor 3 and the recent direct upper limit from the LIGO and VIRGO experiments a factor 2. A combined analysis of future satellite missions as COrE and EUCLID could improve current bound by more than an order of magnitude.Comment: 9 pages, 1 figure, matching the version published on PL

Mind the gap! Global cities and ordinary cities in the planning perspective

This paper presents a critical debate about the extreme selectivity through which the existing body of literature identifies the critical factors in urban development and competitiveness. It highlights the need to establish policies aimed at “ordinary cities†(Amine Graham, 1997) and “ordinary geographies†(Jonas e Ward, 2007). By analyzing the case of Rome, Italy, the paper explores the consequences of such literature for planning choices, especially for those cities that are not supported by a mature system of governance. It is well established that cities and urban regions are considered the most significant organizational and social units in the post-industrial era. The academic focus on urban regions was a result of the convergence between studies on competitiveness and disciplines like Regional Economy and Economic Geography, which tended to focus on the relationship between post-industrial capitalism and the process of regionalization. Since the first studies on industrial de-verticalization and on emerging patterns of production localization, the literature has increasingly related the economic success of firms to specific characters of territories, including face-to-face contacts, knowledge spill over and relationships based on trust. All cities, then, are framed to look like the leaders of the global urban hierarchy: Global City Regions and Mega City Regions, large territories combining hard and soft infrastructures, socializing spaces, multi-culturality, talent, tolerance; cities offering a network structure made up of Marshall nodes of production. The rigidity of current conceptions of urban competitiveness, supported also by international organizations (OCDE, 2006; Territorial Agenda, 2007), often leads to negative consequences for urban planning policies in cities that are not yet supported by a developed system of governance. This is the case for Rome, where planning policy has followed guidelines proposed by existing literature. The article argues that the oversimplification of urban development and competitiveness can result in planning policies divorced from the real issues, thus causing a unique set of social and environmental consequences.

Cosmological constraints on the neutron lifetime

We derive new constraints on the neutron lifetime based on the recent Planck 2015 observations of temperature and polarization anisotropies of the CMB. Under the assumption of standard Big Bang Nucleosynthesis, we show that Planck data constrains the neutron lifetime to $\tau_n=(907 \pm 69) \, [\text{s}]$ at $68 \%$ c.l.. Moreover, by including the direct measurements of primordial Helium abundance of Aver et al. (2015) and Izotov et al. (2014), we show that cosmological data provide the stringent constraints $\tau_n=(875 \pm 19) \, [\text{s}]$ and $\tau_n=(921 \pm 11) \, [\text{s}]$ respectively. The latter appears to be in tension with neutron lifetime value quoted by the Particle Data Group ($\tau_n=(880.3 \pm 1.1) \, [\text{s}]$). Future CMB surveys as COrE+, in combination with a weak lensing survey as EUCLID, could constrain the neutron lifetime up to a $\sim 6 \, [\text{s}]$ precision.Comment: 13 pages, 3 figures. Matching JCAP accepted versio

Regenerating Urban Spaces under Place-specific Social Contexts: a Commentary on Green Infrastructures for Landscape Conservation

This study investigates the issue of green infrastructures in contemporary cities, adopting a strategic vision for increasingly complex metropolitan regions. Green infrastructures play an important role in ecological services and biodiversity preservation, improving significantly the quality of life of residents and visitors. The social dimension of gardens and parks at local (e.g. urban district) scale and green infrastructures at larger spatial scales is also addressed, fostering the relationship between local communities and urban landscapes. With economic crisis, urban parks are increasingly considered a primary component of integrated strategies for urban regeneration with a bottom-up approach, addressing the demand for "natural landscape" in peri-urban areas. By recovering public spaces with social purposes and providing a comprehensive strategy for aesthetic improvement of common goods, the analyzed case studies give examples of specific measures for promoting environment-friendly urban regeneration strategies under place-specific social contexts

A Fifty-Year Sustainability Assessment of Italian Agro-Forest Districts

DistrictAs cropland management and land use shifted towards more intensive practices, global land degradation increased drastically. Understanding relationships between ecological and socioeconomic drivers of soil and landscape degradation within these landscapes in economically dynamic contexts such as the Mediterranean region, requires multi-target and multi-scalar approaches covering long-term periods. This study provides an original approach for identifying desertification risk drivers and sustainable land management strategies within Italian agro-forest districts. An Environmental Sensitivity Area (ESA) approach, based on four thematic indicators (climate, soil, vegetation and land-use) and a composite index of desertification risk (ESAI), was used to evaluate changes in soil vulnerability and landscape degradation between the years 1960 and 2010. A multivariate model was developed to identify the most relevant drivers causing changes in land susceptibility at the district scale. Larger districts, and those with a higher proportion of their total surface area classified as agro-forest, had a significantly lower increase in land susceptibility to degradation during the 50 years when compared with the remaining districts. We conclude that preserving economic viability and ecological connectivity of traditional, extensive agricultural systems is a key measure to mitigate the desertification risk in the Mediterranean region