Badrun Nessa Ahemd Tamanna | Leibniz Universität Hannover (original) (raw)
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Books by Badrun Nessa Ahemd Tamanna
This paper presents an estimation of the impact of microcredit on income poverty, following a qua... more This paper presents an estimation of the impact of microcredit on income poverty, following a quasi-experiment specifically designed to control for endogeneity and selection bias in the context of urban Mexico. Although we find impacts on income poverty, the magnitude of the effect is marginal and only significant among moderate poor. We find no evidence of impacts on extreme poverty. The evidence points to a link between poverty impacts and lending technology. Rigid screening and monitoring devices used by group lending contracts generate a utility cost of borrowing that undermines the efforts of poverty alleviation.
Papers by Badrun Nessa Ahemd Tamanna
gbv.de
... 12 Refugee or migrant? 13 2. Climate Change and Forced Migration 16 Not such a wonderful worl... more ... 12 Refugee or migrant? 13 2. Climate Change and Forced Migration 16 Not such a wonderful world 16 ... 33 4.4 Health impacts and welfare of forced migrants 34 Climate change migration: A gender perspective 34 Page 3. 5. Policy Responses 36 Heads in the sand 36 5.1. ...
Journal of …, Jan 1, 2002
Global warming is a key threat to biodiversity, but few researchers have assessed the magnitude o... more Global warming is a key threat to biodiversity, but few researchers have assessed the magnitude of this threat at the global scale. We used major vegetation types (biomes) as proxies for natural habitats and, based on projected future biome distributions under doubled-CO 2 climates, calculated changes in habitat areas and associated extinctions of endemic plant and vertebrate species in biodiversity hotspots. Because of numerous uncertainties in this approach, we undertook a sensitivity analysis of multiple factors that included (1) two global vegetation models, (2) different numbers of biome classes in our biome classification schemes, (3) different assumptions about whether species distributions were biome specific or not, and (4) different migration capabilities. Extinctions were calculated using both species-area and endemic-area relationships. In addition, average required migration rates were calculated for each hotspot assuming a doubled-CO 2 climate in 100 years. Projected percent extinctions ranged from <1 to 43% of the endemic biota (average 11.6%), with biome specificity having the greatest influence on the estimates, followed by the global vegetation model and then by migration and biome classification assumptions. Bootstrap comparisons indicated that effects on hotpots as a group were not significantly different from effects on random same-biome collections of grid cells with respect to biome change or migration rates; in some scenarios, however, hotspots exhibited relatively high biome change and low migration rates. Especially vulnerable hotspots were the Cape Floristic Region, Caribbean, Indo-Burma, Mediterranean Basin, Southwest Australia, and Tropical Andes, where plant extinctions per hotspot sometimes exceeded 2000 species. Under the assumption that projected habitat changes were attained in 100 years, estimated global-warming-induced rates of species extinctions in tropical hotspots in some cases exceeded those due to deforestation, supporting suggestions that global warming is one of the most serious threats to the planet's biodiversity.
This paper presents an estimation of the impact of microcredit on income poverty, following a qua... more This paper presents an estimation of the impact of microcredit on income poverty, following a quasi-experiment specifically designed to control for endogeneity and selection bias in the context of urban Mexico. Although we find impacts on income poverty, the magnitude of the effect is marginal and only significant among moderate poor. We find no evidence of impacts on extreme poverty. The evidence points to a link between poverty impacts and lending technology. Rigid screening and monitoring devices used by group lending contracts generate a utility cost of borrowing that undermines the efforts of poverty alleviation.
gbv.de
... 12 Refugee or migrant? 13 2. Climate Change and Forced Migration 16 Not such a wonderful worl... more ... 12 Refugee or migrant? 13 2. Climate Change and Forced Migration 16 Not such a wonderful world 16 ... 33 4.4 Health impacts and welfare of forced migrants 34 Climate change migration: A gender perspective 34 Page 3. 5. Policy Responses 36 Heads in the sand 36 5.1. ...
Journal of …, Jan 1, 2002
Global warming is a key threat to biodiversity, but few researchers have assessed the magnitude o... more Global warming is a key threat to biodiversity, but few researchers have assessed the magnitude of this threat at the global scale. We used major vegetation types (biomes) as proxies for natural habitats and, based on projected future biome distributions under doubled-CO 2 climates, calculated changes in habitat areas and associated extinctions of endemic plant and vertebrate species in biodiversity hotspots. Because of numerous uncertainties in this approach, we undertook a sensitivity analysis of multiple factors that included (1) two global vegetation models, (2) different numbers of biome classes in our biome classification schemes, (3) different assumptions about whether species distributions were biome specific or not, and (4) different migration capabilities. Extinctions were calculated using both species-area and endemic-area relationships. In addition, average required migration rates were calculated for each hotspot assuming a doubled-CO 2 climate in 100 years. Projected percent extinctions ranged from <1 to 43% of the endemic biota (average 11.6%), with biome specificity having the greatest influence on the estimates, followed by the global vegetation model and then by migration and biome classification assumptions. Bootstrap comparisons indicated that effects on hotpots as a group were not significantly different from effects on random same-biome collections of grid cells with respect to biome change or migration rates; in some scenarios, however, hotspots exhibited relatively high biome change and low migration rates. Especially vulnerable hotspots were the Cape Floristic Region, Caribbean, Indo-Burma, Mediterranean Basin, Southwest Australia, and Tropical Andes, where plant extinctions per hotspot sometimes exceeded 2000 species. Under the assumption that projected habitat changes were attained in 100 years, estimated global-warming-induced rates of species extinctions in tropical hotspots in some cases exceeded those due to deforestation, supporting suggestions that global warming is one of the most serious threats to the planet's biodiversity.