scholarly journals Global urban population exposure to extreme heat

2021 ◽  
Vol 118 (41) ◽  
pp. e2024792118
Author(s):  
Cascade Tuholske ◽  
Kelly Caylor ◽  
Chris Funk ◽  
Andrew Verdin ◽  
Stuart Sweeney ◽  
...  
Keyword(s):  
Population Growth ◽  
Urban Population ◽  
Heat Exposure ◽  
Early Warning Systems ◽  
Extreme Heat ◽  
Population Exposure ◽  
Urban Warming ◽  
Urban Settlements ◽  
Urban Population Growth ◽  
Fine Resolution

Increased exposure to extreme heat from both climate change and the urban heat island effect—total urban warming—threatens the sustainability of rapidly growing urban settlements worldwide. Extreme heat exposure is highly unequal and severely impacts the urban poor. While previous studies have quantified global exposure to extreme heat, the lack of a globally accurate, fine-resolution temporal analysis of urban exposure crucially limits our ability to deploy adaptations. Here, we estimate daily urban population exposure to extreme heat for 13,115 urban settlements from 1983 to 2016. We harmonize global, fine-resolution (0.05°), daily temperature maxima and relative humidity estimates with geolocated and longitudinal global urban population data. We measure the average annual rate of increase in exposure (person-days/year−1) at the global, regional, national, and municipality levels, separating the contribution to exposure trajectories from urban population growth versus total urban warming. Using a daily maximum wet bulb globe temperature threshold of 30 °C, global exposure increased nearly 200% from 1983 to 2016. Total urban warming elevated the annual increase in exposure by 52% compared to urban population growth alone. Exposure trajectories increased for 46% of urban settlements, which together in 2016 comprised 23% of the planet’s population (1.7 billion people). However, how total urban warming and population growth drove exposure trajectories is spatially heterogeneous. This study reinforces the importance of employing multiple extreme heat exposure metrics to identify local patterns and compare exposure trends across geographies. Our results suggest that previous research underestimates extreme heat exposure, highlighting the urgency for targeted adaptations and early warning systems to reduce harm from urban extreme heat exposure.

scholarly journals PENGGUNAAN HASIL SENSUS UNTUK ESTIMASI URBANISASI

Populasi ◽  
2016 ◽  
Vol 2 (1) ◽  
Author(s):  
Muhadjir Darwin ◽  
Tukiran Tukiran
Keyword(s):  
Population Growth ◽  
Longitudinal Analysis ◽  
Urban Population ◽  
Steady Increase ◽  
Population Number ◽  
Large Cities ◽  
Cross Country ◽  
Definition Of ◽  
Urban Population Growth

Urbanization canbedefined inmanyways: various definitions concerning it are found in population literature. Different censuses also tend to define the concept of urban differently. This inconsistency of definitionhas obstructed those who want to conduct acomparative analysis on urbanization, both cross- country and longitudinal analysis of a country. This article attempts to examine the problem by clarifying the definition of the concept and indicators of urban and urbanization and by making a longitudinal analysis of urbanization using the Indonesian 1920-1990 Cencus data. Regardless of how the concept of urban is defined in each census, this analysis has found a steady increase in urban population number. However, if the different definitions of the concept are taken into consideration, it may bring up different conclusion. Part of the reasons of the increase is a reclassification of village' status from being rural to become urban. Oneway to prove this proposition is by comparing the level of urban population growth between large cities and their surrounding regencies. This analysis clearly shows that the latter has higher population growth than the former.

Past, Present and Future Population Growth and Urban Management in Zimbabwe

2018 ◽  
pp. 1197-1214
Author(s):  
Innocent Chirisa ◽  
Aaron Maphosa ◽  
Lazarus Zanamwe ◽  
Elmond Bandauko ◽  
Liaison Mukarwi
Keyword(s):  
Population Growth ◽  
Growth Rates ◽  
Urban Population ◽  
Urban Infrastructure ◽  
Natural Increase ◽  
Urban Migration ◽  
Urban Management ◽  
Population Growth Rates ◽  
Secondary Sources ◽  
Urban Population Growth

The central focus of this chapter is to analyse the urban population growth–urban management nexus in Zimbabwean cities. These cities are registering rapid population growth rates, due mainly to massive rural to urban migration and natural increase. Ideally, rapid urban population growth rates should be proportionate to urban infrastructure, facilities and services. This is not in the case in Zimbabwean cities, where the development of informal settlements, rising urban poverty, dilapidated urban infrastructure and other urban developmental challenges are rampant. Drawing from Malthusian theory, the current conditions in Zimbabwean cities represents that stage where the positive and negative checks are expected. In putting together this chapter, we used archival sources such as newspapers, government reports and other secondary sources. We conclude that planning initiatives and population control measures need to be used in Zimbabwean cities to address inefficiency and urban management challenges, which may be compromising urban sustainability. This study provides evidence-based information that urban local authorities may use to formulate policies to manage urban problems.

Getting urban density to work in informal settlements in Africa

2020 ◽  
Vol 32 (2) ◽  
pp. 351-370 ◽  
Author(s):  
Justin Visagie ◽  
Ivan Turok
Keyword(s):  
Population Growth ◽  
Urban Population ◽  
Informal Settlements ◽  
Participatory Planning ◽  
Tenure Security ◽  
Urban Density ◽  
The Core ◽  
Basic Services ◽  
Urban Population Growth

The drawbacks of crowded informal settlements stand in stark contrast to the theoretical promise that urban density is the key to building more productive, sustainable and resilient cities. African cities cannot be expected to prosper while the majority of residents live in sprawling informal settlements with no prospect of improvement beyond the provision of basic services. There is a strong case for governments to embrace a broader reconstruction agenda in order to harness the potential of density for all-round progress. The core proposition of the paper is that urban population growth would be accommodated more effectively by building upwards and not merely outwards. We consider the circumstances under which this is true and how the state and communities might refashion conditions in informal settlements despite their restricted resources. To expand upwards requires participatory planning, more tenure security, settlement redesign, and in-situ investments in public services and housing.

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