Urbanisation is an increasing proportion living in defined urban areas; urban growth is an increase in the count. Invented totals of 40/100 and 48/120 both give 40%, despite a growing urban count.
Definitions and boundaries matter. The UN World Urbanization Prospects 2025 distinguishes cities, towns and rural areas. Older national urban definitions and projections are not interchangeable with its city-only category. Megacity conventionally means at least ten million people in a defined urban area.
Count versus share: invented data
Causes
Urban population change combines births, deaths, migration and boundary or classification changes. Push and pull factors can influence migration, but perceived opportunities are not guaranteed jobs or services.
Age structure can affect natural increase, but not every migrant is young or has the same family circumstances. Compare places and periods instead of assuming a universal income-group growth rate.
Components of urban population change
Case study: Lagos, Nigeria
Lagos has important trade, employment and cultural links, alongside pressures on housing, transport and services. Exact population and deprivation shares require a date, boundary and method; the lesson does not retain unsupported undated totals.
Makoko includes waterfront and land areas. Housing conditions, service access and tenure differ. Informal work can support livelihoods while lacking adequate formal protection; it is not synonymous with crime or an absence of all regulation and tax.
BRT and neighbourhood upgrading should be evaluated for coverage, reliability, affordability, rights and maintenance. The original Makoko Floating School was a prototype and collapsed; it must not be presented as a currently operating solution. Later design iterations are different projects.
Imagined settlement, services and work
Evaluate upgrading and comparisons
Brazilian favelas vary in location, building quality, services and tenure. A comparison with Lagos needs evidence for named neighbourhoods and dates, not a claim that all settlements are identical or on steep slopes.
In-situ upgrading may preserve community links while improving services, but site hazards, rights, affordability and resident participation matter. Self-help schemes require materials, finance and safe support; clearance can displace people and cannot be assumed an uncomplicated improvement.
Evaluate an upgrading proposal
投影片
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