SOURCES : SCIENTIFIC AMERICAN ( URBANIZED AREA OF EARTH ); SMART CITY HUB ( 1975 MEGACITIES ); “ UN WORLD URBANIZATION PROSPECTS , 2018 ” ( 2030 MEGACITIES ); SMART CITY HUB ( AFRICAN URBANIZATION ); AMERICAN PUBLIC TRANSPORTATION ASSOCIATION ( PUBLIC TRANSIT ECONOMIC RETURNS ); OECD INTERNATIONAL TRANSPORT FORUM ( URBAN PASSENGER MILES ); AMERICAN COMMUNITY SURVEY ( HOME BUYERS ’ PREFERENCES ); “ UN WORLD URBANIZATION PROSPECTS , 2018 ” ( 2050 WORLD POPULATION ); JOURNAL OF ENERGY POLICY ( CO2 EMISSIONS ); ALL OTHER STATISTICS , HP (“ CITY EVOLUTION " REPORT )
3
Number of megacities with populations over 10 million in 1975 : Mexico City , New York , and Tokyo
43
Number of megacities by 2030
48 %
Reduction in travel-related CO2 emissions when urban density doubles
5:1
Ratio of economic return to economic investment in US public transportation
25 %
of new construction in Dubai will be 3D printed by 2030
2035
34 %
of urban passenger miles will be via public transport by 2030 , up from 30 % in 2015
²/ ₃
Global energy consumption attributable to cities
$
400 billion
Year by which half the population of Africa — the least urbanized continent — will live in cities $ 3 , 685
60 %
of American home buyers prefer properties with a shorter commute and amenities nearby
Average monthly cost of a two-bedroom apartment in Hong Kong , the world ’ s city with the highest housing costs
36 %
of cities will face water shortages by 2050
Cost of seawalls to protect US cities and coastal communities through 2040
68 %
of the world ’ s population will live in urban areas by 2050
7 of the world ’ s 10 most populated cities will be in Asia by 2035 . Jakarta is projected to be
the largest , with a
38
population of million HP / INNOVATION / SPRING 2021 15