NYC, Tokyo, Delhi: These maps chart the growth in area and population of 20 megacities

Today there are more than 30 cities with a population over 10 million. Fortune charts how the most populous urbanized areas have changed since 1990.

Energy and material flows of megacities

The 21st Century Cities in Global History – Applied Unificationism

GAPS-megacities: A new global platform for investigating persistent organic pollutants and chemicals of emerging concern in urban air - ScienceDirect

How Many U.S. Cities Can You Fit Inside Tokyo? - Metrocosm

The megacity challenge: how to deal with rapid population growth - Geographical

Animated Map: The 20 Most Populous Cities in the World by 2100

Focusing on World Megacities: Demographia World Urban Areas, 2021

Sustainability, Free Full-Text

Urban Science, Free Full-Text

Evolution of megacities, showing percentage urban and urban

Strength and weaknesses: A comparison of Beijing with four Bemajor metropolises

Mega cities - the biggest cities all over the world