Changes in agricultural land use have important implications for environmental services. Previous studies of agricultural land‐use futures have been published indicating large uncertainty due to different model assumptions and methodologies. In this article we present a first comprehensive comparison of global agro‐economic models that have harmonized drivers of population, GDP, and biophysical yields. The comparison allows us to ask two research questions: (1) How much cropland will be used under different socioeconomic and climate change scenarios? (2) How can differences in model results be explained? The comparison includes four partial and six general equilibrium models that differ in how they model land supply and amount of potentially available land. We analyze results of two different socioeconomic scenarios and three climate scenarios (one with constant climate). Most models (7 out of 10) project an increase of cropland of 10–25% by 2050 compared to 2005 (under constant climate), but one model projects a decrease. Pasture land expands in some models, which increase the treat on natural vegetation further. Across all models most of the cropland expansion takes place in South America and sub‐Saharan Africa. In general, the strongest differences in model results are related to differences in the costs of land expansion, the endogenous productivity responses, and the assumptions about potential cropland. 相似文献
The community cooperatives that are spreading today in many parts of the world are the arrival point of an evolutionary process that has seen the progressive shift of cooperatives’ focus from specific social and professional groups to society as a whole. This evolution is marked by two changes. The first was at the turn of the 19th century when there made their appearance the first community cooperatives which catered to the needs of a whole community. Among them were electric cooperatives, cooperative banks and some kinds of agricultural cooperatives. A further development relevant to the evolution of community cooperatives occurred towards the end of the last century with the enlargement of cooperatives’ aims to embrace society's benefit. From this process there emerge in total four categories of cooperatives which taken together constitute a complete classification of the cooperative universe. New community cooperatives are the off‐springs of the old ones but the picture is rather confused. The term itself is relatively new and similar institutions are named differently at different times. Moreover, though having a few basic features in common, they differ much from one another and from the old ones. To take care of this we elaborate a concept of community cooperative consistent with its evolution and the classification of cooperatives we have identified. Basic elements of the concept are community goods, territory and citizenship, which are discussed extensively with reference to factual cases. We then discuss in what way new community cooperatives differ from old ones. The paper closes with a discussion of their future prospects. 相似文献
Quality & Quantity - Sri Lankans constitute one of Italy's oldest foreign communities. A comparative geographic study of Sri Lankans’ settlement patterns in three main municipalities... 相似文献
One of the most important challenges for social venture entrepreneurs is acquiring resources. Reward crowdfunding is considered a suitable tool for meeting the financing needs of social ventures, whose backers are particularly interested in firm ideas and core values rather than in collaterals or business plans. A strategic factor that is able to influence the outcome of crowdfunding campaigns is the entrepreneurial narrative. Very few scholars have examined the key factors that support a crowdfunding campaign, particularly those on reward-based crowdfunding platforms, and the effects of entrepreneurial narratives on investors’ decisions. Aiming to fill this research gap, this paper investigates how entrepreneurs in the technology industry describe their social ventures and projects on Eppela, an Italian reward-based crowdfunding platform. Thematic analysis was applied to detect the five following key factors of effective entrepreneurial narratives in reward-based crowdfunding campaigns for social ventures: 1) problem/need; 2) project; 3) product; 4) team; and 5) venture. Each key factor includes specific subfactors. Lexical data analysis was then performed to identify the following expected effects of the examined entrepreneurial narratives on potential investors, leading these investors to understand, trust, and approve the project proposal, and thus, finance the social venture’s project: 1) reassurance, 2) reliability, and 3) credibility. Based on these results, this study proposes an explanatory model about how to design effective entrepreneurial narratives to be presented to contribute as much as possible to the success of projects in crowdfunding platforms.
International Tax and Public Finance - We propose a two-period pure-exchange economy with spot and nominal security markets and a government that enacts a debt-financed tax cut in the first period... 相似文献
Environmental and Resource Economics - As the Intergovernmental Panel on Climate Change (2018) testifies, the world is a long way from halting climate change, let alone reverting it. The existence... 相似文献
We offer a new vantage to the literature on the role of infomediaries in incumbent firms' struggles to adopt discontinuous technologies: the perspective of news media. Specifically, we combine the discontinuous technology literature with studies on news media journalism to theorize that journalists cover an incumbent's new product introductions differently, depending on whether a given new product builds on a discontinuous technology or on the respective established, continuous technology. First, discontinuous-technology-based product introductions receive a greater volume of coverage than continuous-technology-based product introductions because journalists prefer covering issues that are novel, deviate from the conventional, and potentially strongly impact society. Second, the coverage of discontinuous-technology-based product introductions is more divergent in tenor than the coverage of continuous-technology-based product introductions, as journalists seek to present opposing and thus more engaging opinions. Our analyses of unique archival data from two samples of product introductions in the automotive and photography industries, respectively, support our hypotheses. We also find intriguing indications that news media coverage of new products introductions using hybrid technologies is significantly context-dependent. Overall, our study points to so-far undescribed, media-related dilemmas for incumbent firms that aim to adopt discontinuous technologies. 相似文献