Uber service area expansion in three major American cities

2020 ◽  
Vol 86 ◽  
pp. 102752
Author(s):  
Steven R. Gehrke
Author(s):  
Shotaro Sasaki ◽  
Mitoshi Fujimoto ◽  
Katsutoshi Kawai ◽  
Toshinori Iinuma

2008 ◽  
Vol 56 (10) ◽  
pp. 3285-3292 ◽  
Author(s):  
Takashi Maruyama ◽  
Yushi Shirato ◽  
Mamoru Akimoto ◽  
Masashi Nakatsugawa

1970 ◽  
Author(s):  
Jose I. Lasaga ◽  
Malcolm Kushner
Keyword(s):  

2019 ◽  
Author(s):  
Grant Duffy ◽  
Jasmine R Lee

Warming across ice-covered regions will result in changes to both the physical and climatic environment, revealing new ice-free habitat and new climatically suitable habitats for non-native species establishment. Recent studies have independently quantified each of these aspects in Antarctica, where ice-free areas form crucial habitat for the majority of terrestrial biodiversity. Here we synthesise projections of Antarctic ice-free area expansion, recent spatial predictions of non-native species risk, and the frequency of human activities to quantify how these facets of anthropogenic change may interact now and in the future. Under a high-emissions future climate scenario, over a quarter of ice-free area and over 80 % of the ~14 thousand km2 of newly uncovered ice-free area could be vulnerable to invasion by one or more of the modelled non-native species by the end of the century. Ice-free areas identified as vulnerable to non-native species establishment were significantly closer to human activity than unsuitable areas were. Furthermore, almost half of the new vulnerable ice-free area is within 20 km of a site of current human activity. The Antarctic Peninsula, where human activity is heavily concentrated, will be at particular risk. The implications of this for conservation values of Antarctica and the management efforts required to mitigate against it are in need of urgent consideration.


Author(s):  
Jason Knight ◽  
Mohammad Gharipour

How can urban redevelopment benefit existing low-income communities? The history of urban redevelopment is one of disruption of poor communities. Renewal historically offered benefits to the place while pushing out the people. In some cases, displacement is intentional, in others it is unintentional. Often, it is the byproduct of the quest for profits. Regardless of motives, traditional communities, defined by cultural connections, are often disrupted. Disadvantaged neighborhoods include vacant units, which diminish the community and hold back investment. In the postwar period, American cities entered into a program of urban renewal. While this program cleared blight, it also drove displacement among the cities’ poorest and was particularly hard on minority populations clustered in downtown slums. The consequences of these decisions continue to play out today. Concentration of poverty is increasing and American cities are becoming more segregated. As neighborhoods improve, poorer residents are uprooted and forced into even more distressed conditions, elsewhere. This paper examines the history of events impacting urban communities. It further reviews the successes and failures of efforts to benefit low-income communities.


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