In-depth Notes on Skyscrapers: "The Heights" by Kate Ascher

Proliferation: Since 2000, the number of skyscrapers over 600 feet has significantly increased, with a marked growth in construction globally.

Regional Shifts: Originally a U.S.-centric phenomenon, skyscraper construction is now prominent in Asia and the Middle East; for example, 22 of the 38 skyscrapers completed in 2009 were in Asia. Hong Kong has the tallest aggregate height of skyscrapers compared to New York City, making it the "tallest" metropolis in the world.

Definitions: - "Tall" buildings: 500 to 1,000 feet (150 to 300 meters)

• "Supertall" buildings: above 1,000 feet (300 meters)

Urbanization: By 2050, it is estimated that 70% of the global population will reside in urban areas, making skyscrapers essential for accommodating growing populations and shaping urban living environments.