880 research outputs found
Internal Displacement in the United States: A Result of Climate Change and U.S. Policy
Abstract
Internal Displacement in the United States: A Result of Climate Change and U.S. Policy by
Ahmad Tidjany Diop
Advisor: Karen Miller
This thesis will focus on arguments for an open border. I demonstrate that open borders are necessary because land is scarce. I focus on the United States, which is currently dealing with internal displacement due to climate change. The moral, human rights, and political claims I will make open borders are reasonable because climate change will make certain parts of the world uninhabitable.
When I say internal displacement I am referring to those displaced in the United States due to climate change as we have seen with Hurricane Katrina in which residents of New Orleans were displaced from their homes and relocated to Houston and other states due to the breaking of the levies. The climate is continuously changing for the worse, although perceptions of this shift depend on how one views climate change.
Climate change is accelerating, as we can see from recent wildfires in California and the melting of icebergs in Antarctica. The earth is warming and sea levels are rising. This thesis examines the deleterious effects that these shifts are having on human populations. As things currently stand there is a large buildup of heat in the oceans which suggest that there is a faster rate of global warming according to recent scientific studies. I argue that it is the responsibility of all nations to address this crisis and to welcome climate refugees
Diachronic Analysis of Vegetation in the Sylvopastoral Zone (Senegal): What Lesson to Learn from?
Mitigation and Adaptation Strategies â Organic Agriculture
This psoter presents information on the following
- The concept of organic farming in the context of climate change
- Carbon sequestration on organic farms
- Consequences of an area-wide conversion to organic agricultur
Effet du chlorure de sodium sur la germination de graines de Ricinus communis L.
Ricinus communis L (ricin) figure parmi les espĂšces du Programme biocarburant au SĂ©nĂ©gal. Sa culture sur des terrains incultes (terres salĂ©es) constitue une alternative pour Ă©viter une concurrence sur les terres Ă vocation agricole. Câest pourquoi le taux de germination (TG) de sept accessions de graines de ricin a Ă©tĂ© Ă©tudiĂ© pendant 15 jours sous des concentrations croissantes de NaCl (0; 20; 50; 80; 100; 150 et 200 mM). Les rĂ©sultats ont montrĂ© une large variabilitĂ© de tolĂ©rance au sel au stade de la germination. Les accessions 3 et 8 ont Ă©tĂ© trĂšs sensibles avec des TG rĂ©duits seulement Ă la concentration 20 mM NaCl. Les accessions 1, 6 et 7 nâont pas tolĂ©rĂ© la concentration 50 mM. Lâaccession 5 nâa tolĂ©rĂ© que les teneurs < 80 mM. Lâaccession 4 a germĂ© dans les milieux †100 mM NaCl. Elle nâa manifestĂ© une perte significative de TG quâen prĂ©sence de 150 mM NaCl. Elle a Ă©tĂ© la moins affectĂ©e par lâeffet ralentisseur du sel sur la vitesse de germination. Ces rĂ©sultats permettent de dire que le mode dâaction de NaCl sur la germination est de nature osmotique et/ou toxique.Mots clĂ©s : Ricin, espĂšce, biocarburant, tolĂ©rance au sel, teneur en sel, SĂ©nĂ©gal
Etude Comparative de lâeffet de Souches de Champignons Mycorhiziens Arbusculaires sur la Croissance et la Nutrition MinĂ©rale du SĂ©same CultivĂ© au SĂ©nĂ©gal
La croissance et la nutrition minĂ©rale de huit variĂ©tĂ©s locales de SĂ©same (Sesamum indicum L.) ont Ă©tĂ© Ă©valuĂ©es en rĂ©ponse Ă lâinoculation mycorhizienne arbusculaire. Les essais conduits en serre pendant trois mois, ont montrĂ© un meilleur dĂ©veloppement et une meilleure nutrition minĂ©rale chez les plants inoculĂ©s comparĂ© aux tĂ©moins non inoculĂ©s. Les variĂ©tĂ©s testĂ©es se sont rĂ©vĂ©lĂ©es trĂšs dĂ©pendantes de la mycorhization arbusculaire. Le degrĂ© de dĂ©pendance est gĂ©nĂ©ralement supĂ©rieur Ă 55 % et est fortement corrĂ©lĂ© Ă lâisolat fongique et Ă la variĂ©tĂ© testĂ©e. Il ressort de cette Ă©tude que les biofertilisants Ă base de champignons mycorhiziens procurent des bĂ©nĂ©fices importants Ă la plante, et peuvent ĂȘtre utilisĂ©s pour amĂ©liorer la croissance et le rendement du sĂ©same.Mots ClĂ©s: Biofertilisation, Mycorhizienne, Sesamum indicumThe growth and mineral nutrition of eight local varieties of Sesame (Sesamum indicum L.) were evaluated in response to arbuscular mycorrhiza inoculation in a greenhouse. There was greater plant growth and better mineral nutrition in inoculated pots compared to non-inoculated controls. The varieties tested showed high dependence on arbuscular mycorrhiza. The degree of dependence was generally greater than 55% and was highly correlated with the fungal isolates and variety tested. It is evident that mycorrhizae fungi-based biofertilisers provide significant benefits to the plant and can be used to improve growth and yield in sesame.Keywords: Biofertilisation, Mycorrhiza, Sesamum indicu
Effets de lâinoculation mycorhizienne sur le sesame (Sesamum indicum L.) en conditions naturelles
La prĂ©sence des microorganismes symbiotiques dans le sol constitue un atout pour la majoritĂ© des cultures. Lâinoculation avec des champignons mycorhiziens Ă arbuscules (CMA) est considĂ©rĂ©e comme un des moyens biologiques permettant Ă la culture de rĂ©sister aux stress biotiques et abiotiques, et dâaugmenter la productivitĂ©. Mais en conditions naturelles, la combinaison de plusieurs facteurs a une influence majeure dans lâĂ©tablissement de la mycorhization. Lâinoculation du sĂ©same (Sesamum indicum L.) avec deux souches de Glomus est expĂ©rimentĂ©e en milieu naturel, dans un dispositif en split-plot avec quatre rĂ©pĂ©titions. Cetteinoculation mycorhizienne en milieu naturel a produit les effets suivants : le taux de mycorhization des plants inoculĂ©s reste bas ; lâinoculation nâa pas eu un effet significatif sur le rendement en graines, le nombre decapsules et la biomasse totale comparativement aux plants tĂ©moins naturellement infectĂ©s. Cela montre que, la mycorhization naturelle a eu une efficacitĂ© comparable Ă celle des souches inoculĂ©es sur le sesame. On peut dĂ©duire que les sols de cette zone de Bambey contiendraient des souches de champignons mycorhiziens Ă arbuscules (CMA) indigĂšnes aussi efficaces que des souches sĂ©lectionnĂ©es.© 2013 International Formulae Group. All rights reserved.Mots clĂ©s : Mycorhization naturelle, Glomus mosseae, Glomus fasciculatum, sĂ©same, productivitĂ©
Effet de la salinité sur la croissance et la production de biomasse de deux provenances de Jatropha curcas L. cultivés en serre
La salinisation des sols est un processus important de dĂ©gradation des sols. Ce phĂ©nomĂšne ne cesse de prendre de lâampleur. Il affecte la croissance et le rendement des cultures. Lâutilisation dâespĂšces Ă usages multiples telle que Jatropha curcas L. et capable de se dĂ©velopper dans ces milieux est dâune importance capitale. Cette Ă©tude a portĂ© sur lâeffet de diffĂ©rentes concentrations de NaCl (0 g/l, 2 g/l, 4 g/l, 8 g/l, 16 g/l et 35 g/l) pendant une durĂ©e de 42 jours sur des jeunes plants de deux provenances (Nioro et Kaffrine) de Jatropha curcas L en condition de serre vitrĂ©e. La tolĂ©rance des deux provenances par rapport aux diffĂ©rentes concentrations de NaCl a Ă©tĂ© Ă©tudiĂ©e en tenant compte des paramĂštres de croissance et de rendement. Les rĂ©sultats ont montrĂ© que la hauteur des tiges, le diamĂštre au collet, la biomasse sĂšche des parties aĂ©riennes et des parties racinaires Ă©valuĂ©s Ă la fin de lâexpĂ©rience varient en fonction du niveau du stress salin. Les deux provenances ont montrĂ© une tolĂ©rance Ă la salinitĂ© manifestĂ©e par la rĂ©duction dâun appareil aĂ©rien et racinaire important. La provenance Nioro prĂ©sente une croissance des organes aĂ©riens plus importante que celle de Kaffrine. Cependant, la provenance Kaffrine produit plus de biomasse sĂšche aĂ©rienne. Cette diffĂ©rence se situe au niveau de la quantitĂ© de biomasse sĂšche apportĂ©e par les tiges.Mots clĂ©s : Stress salin, croissance, biomasse, Jatropha curcas L., provenance
Towards Non-Invasive Bedside Monitoring of Cerebral Blood Flow and Oxygen Metabolism in Brain-Injured Patients with Near-Infrared Spectroscopy
Synthesis, characterisation and crystal structure of [(CH<sub>3</sub>)<sub>2</sub>CH]<sub>2</sub>NH<sub>2</sub>(PhPO<sub>3</sub>H)<sub>2</sub>SnPh<sub>3</sub>
Social Capital and Citizensâ Attitudes towards Migrant Workers
This study examines Qatari citizensâ attitudes toward migrant workers. While much research has been conducted on citizensâ attitudes toward the abolition, tightening, or loosening of the KafÄla system in the Gulf Cooperation Council (GCC) countries with regard to migrant workersâ residency rights, and on their contribution to the economic development of these countries, little is known about how citizensâ religiosity and social engagement impact their acceptance of migrant workers. In the present study, we address this question by examining the effects of religious and social capital on Qatari citizensâ preferences for having Arab and Western migrant workers as neighbours, drawing on data from two nationally representative surveys in Qatar. The results indicate that, even after controlling for a wide range of socio-demographic attributes, social capital in terms of trust and bridging social ties has a strong effect on the Qatari nationalsâ preferences
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