How Chicago is Being Unbuilt: Back to Nature

Scientific Concepts, Discoveries, and Nature-Related Phenomena Mentioned

Urban ecology & environmental impacts

• Urban water dependence: Cities often form near vital natural resources, especially water access for:
  • trade
  • drinking water
  • sewage disposal
  • aesthetic value
• Ecosystem imbalance from overuse: Development can overwhelm natural systems, causing:
  • stormwater runoff
  • heat island effects
  • smog
  • animal habitat destruction
  • excessive energy consumption
• Nonlinear environmental outcomes: Ecological harm is described as not directly correlated with city size, but with design decisions made at multiple scales.

Landscape restoration and adaptive design

• “Breaking down” hard infrastructure edges: Hard edges are described as being converted into layered plant/water thresholds to improve ecological function and encourage engagement.
• Native habitat maturation: Wetlands and savannah areas are described as maturing over time, attracting birds, fish, and other native species.
• Research through observation and sampling:
  • soil sampling
  • species monitoring
  • tracking climate-change effects

Stormwater management and green infrastructure

• Green roofs: Millennium Park is described as the world’s largest green roof, built over transportation and parking infrastructure.
• Permeable green roof performance: Lurie Garden native plantings are said to reduce stormwater runoff by ~60%, preventing large volumes of water from becoming runoff.
• Water capture and irrigation reuse: Water harvesting systems collect runoff for irrigation of trees and plantings.

Urban river ecology and water quality

• Wastewater and stormwater treatment: Chicago Riverwalk improvements are linked to reducing combined stormwater + sewage discharge by routing water through water treatment plants before release.
• Habitat-engineering for aquatic life: Habitat structures (e.g., floating wetlands/rafts and mussel units) are designed to:
  • improve ecological conditions (nutrient uptake, food web support)
  • support fish presence and spawning behavior

Aquatic filtration and oxygenation (river micro-ecosystems)

• Floating mussel filtration:
  • “100 giant floater mussels” are described as being fed oxygen via solar-powered pumps
  • estimated to filter ~365,000 gallons of water/year
• Root-zone nutrient uptake:
  • Planter rafts with wetland species (sedges, swamp milkweed, hibiscus) are described as having dangling root systems that draw nutrients from the water.
• Wave/wake-aware floating edges:
  • Modular walkway sections float on polyethylene pontoons, are wrapped/encased with coconut husks, and rise/fall with water movement.

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Locations and “Before vs After” Examples (As Described)

Northerly Island (MIGs Field / airport → park & habitat)

• Historical intervention:
  • MIGs Field was the site of the busiest runway airport in the world until 2003
  • Mayor Richard Daly ordered bulldozers to carve giant X’s into the tarmac
• Shift in landscape design philosophy:
  • originally connected to Daniel Burnham’s 1909 Plan and the City Beautiful movement (monumental axes, channeling forms and water)
  • now a park with ongoing reshaping, including:
    • cut-and-fill land redistribution into hills in a lagoon
    • described future erosion of island boundaries back into Lake Michigan using reefs
• Ecological progression:
  • wetland and savannah areas on the southern end mature and attract native wildlife
  • design strategy: erode clean edges into layered thresholds of materials, plants, and water

Field Museum area (formal lawns → native garden research + education)

• Original design described:
  • formal lawns with stairs/benches/trees/shrubs forming strict corridors and controlled sightlines
  • heavy maintenance requirements (mowing, pruning, irrigation, fertilization)
• Current design described:
  • Rice Foundation Native Garden with native Illinois species
  • designed to support butterflies, bees/wasps, birds, and other wildlife
• Research/education function:
  • researchers study change over time by:
    • analyzing soil samples
    • documenting which species occur
    • tracing climate change effects
• Visual/behavioral change implied:
  • plant growth reduces straight “classical axis” visibility, making human perception more interactive between built form and vegetation

Millennium Park (spectacle + “green roof” ecological function)

• Design origin: tied to Burnham’s 1909 plan as part of Chicago’s “front door.”
• Sustainability and scale claims:
  • described as the world’s largest green roof (~99,127 m² / 24.5 acres)
  • built over train tracks and parking lots
• Design features described:
  • park conceived as multiple “outdoor rooms”
  • ~half the surface is a permeable green roof
  • areas designed for energy self-sufficiency and universal accessibility
  • Lurie Garden plantings reduce runoff by ~60% (~100,000 gallons/year claim)
  • solar panels provide energy for lighting and parking below
  • parking area heating described as passive solar heating

Chicago Riverwalk → “Wild Mile” (restored river edge habitat)

• Precondition for the walkway:
  • water quality improved by diverting combined stormwater/sewage through water treatment plants before discharge
• Riverwalk zoning:
  • described as multiple zones with varying proximity to the river and localized plantings
• Example structures/ecological elements:
  • “River theater” area includes 17 honey locust trees (native to the region)
  • staircase root space uses soil cells to provide deep root volume and protect root balls
  • water harvesting system collects runoff for irrigation
  • river theater / jetty / piers & floating wetland gardens:
    • intended as learning habitats (fishing, native plant identification)
• Wild Mile (modular, floating habitat approach):
  • described as a proof-of-concept with additional approvals progressing as the river stays cleaner
  • intended to create a self-reinforcing feedback loop: access + cleanup support
  • construction includes:
    • modular planters and walkways
    • walkways float on polyethylene pontoons, wrapped with coconut husks
    • supporting heat-treated pine boardwalk that ebbs and flows with water/wake
    • rafts with native wetland plant species (sedges, swamp milkweed, hibiscus) to create root-zone habitat
    • a submerged unit described as holding 100 giant floater mussels
      • oxygen supplied by solar-powered pumps
      • filtering claim: 365,000 gallons/year
  • described advantage:
    • a more resilient/adaptable edge than a fixed straight shoreline wall

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Researchers or Sources Featured (Named in the Subtitles)

• Richard Daly (mayor mentioned; ordered changes at MIGs Field in 2003)
• Daniel Burnham (1909 plan; City Beautiful design influence; also linked to the 1893 Colombian Exposition design)
• Cuts clothing (sponsor/brand mentioned; not a researcher)