Expand and target urban tree canopy on the hottest, lowest-canopy streets

#00006

Plant and steward trees, prioritizing the specific streets that heat-mapping shows are hottest and have least canopy. Trees cut surface and air temperature through shade and evapotranspiration, and also reduce stormwater runoff.

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Essen, Germany

Ongoing

Giesskannenheld:innen (watering-can heroes), a citizen initiative in Essen, with utility partnerships for water supply · since 2023 · Neighborhood

Founded in July 2023, Giesskannenheld:innen (watering-can heroes) organizes Essen residents to adopt drought-stressed street trees and water them through dry spells. The logistical backbone is a network of 1,000-litre p…

Public water tank capacity1,000 litres per tank, refilled via utility partnerships

Geographic replicationModel adopted in Soest

Grants and crowdfunding; water tank refills provided through utility partnerships · 1 source

Çorum, Türkiye

Failed

Government of Türkiye (national campaign, volunteer planters); survival monitoring by forestry union Tarim Orman-Is (chair Sukru Durmus) · since 2019 · National

On 11 November 2019, the Government of Türkiye planted 11 million saplings in a single day, setting a Guinness world record (most trees planted in one hour at the Çorum site), executed largely by volunteer planters. Wit…

Saplings planted in one day11,000,000saplings

Sapling survival rate (union field checks, months post-planting)11,000,000 planted → ~10% surviving (90% dead per union; contested — government claimed 95% healthy; no independent audit conducted)

Government of Türkiye

Paris, France

Ongoing

Ville de Paris · since 2018 · City

Begun in 2018 as part of Paris's Climate Adaptation and Resilience Strategy, "Les Cours Oasis" depaves asphalt schoolyards and replaces them with trees, permeable ground, shade and water features, then opens them as nei…

Pilot schoolyards transformed10schoolyards

Target schools converted by 2040~760schools

Ville de Paris; European Union Urban Innovative Actions (ERDF) · 3 sources

Singapore

Success

National Parks Board (NParks), Urban Redevelopment Authority, Housing & Development Board · since 1967 · National

Since the 1960s 'Garden City' vision and now the 'City in Nature' / Green Plan 2030 strategy, Singapore grew green cover from 35.7% (1986) to roughly 48% even as urban density rose. Key mechanisms: mandatory greenery re…

Green cover35.7 (1986) → ~48%

Buildings with skyrise greenery213+buildings

Government of Singapore (NParks, URA, HDB) · 4 sources

Medellín, Colombia

Success

Alcaldía de Medellín — Secretaría de Medio Ambiente · since 2016 · City

Launched in 2016 to counter urban heat island effects and severe air pollution in the Aburrá Valley, Medellín built 30+ interconnected 'green corridors' (corredores verdes) along road verges, streams, parks and hillside…

Green corridors created30+corridors

Plants and trees planted2.5M plants + 880,000 trees

$16.3M · Municipality of Medellín (including participatory budget); ~625,000 USD/year maintenance · 4 sources

Freetown, Sierra Leone

Ongoing

Freetown City Council (Mayor Yvonne Aki-Sawyerr) with Greenstand (TreeTracker) and Western Area Rural District Council · since 2020 · City

#FreetownTheTreeTown is a community-driven reforestation program in a rapidly urbanising coastal city that lost roughly 12% of its canopy per year between 2011 and 2018, raising landslide and flood risk. Community growe…

Trees planted & digitally tracked (first 2 years)560,000trees

Program target1,000,000 by 2022 → 5,000,000 by 2030trees

$3M · World Bank & Global Environment Facility (Resilient Urban Sierra Leone Project); carbon-offset token sales · 3 sources

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