2026 Annual Sustainability Report
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Climate Change Adaptation
City Objective: Prepare for the impacts of climate change by empowering people with resources to adapt, cultivating connections between people and native ecosystems, and ensuring safe and reliable infrastructure.
◀️ In 2025, the City received continued recognition as a Tree City U.S.A., building on nearly four and a half decades of outstanding tree care for 100,000 street and park trees in our urban forests and beyond.
Credit: Department of Parks and Recreation
City efforts in 2025 highlight a holistic approach to climate adaptation—one that protects critical ecosystems, equips communities with knowledge and resources, and strengthens connections between people and place.
At Kailua Beach Park, a collaborative dune restoration effort is bringing together City, State, and community partners to restore native vegetation, stabilize sand, and protect a beloved shoreline from ongoing erosion. Hundreds of volunteers contributed to planting thousands of native dune plants at multiple planting events in 2025, helping to preserve beach access while enhancing coastal resilience. To support similar efforts island-wide, the City also released a new Dune Restoration Guide, empowering communities with practical tools to lead and sustain future projects.
At the same time, the City launched “Keep Cool Oʻahu,” a campaign to prepare residents for rising temperatures and more frequent heat waves—one of Oʻahu’s fastest-growing climate hazards. Through multilingual resources and public service messages, the campaign helps residents understand heat risks, recognize signs of heat-related illness, and take simple steps to stay safe and care for one another.
Together, these efforts support implementation of Strategies 1 and 12 of Climate Ready O‘ahu, the City’s climate adaptation strategy, which include actions to increase public understanding of climate hazards, foster preparedness, and keep our communities cool as temperatures rise.
Key Performance Indicators
Climate Ready O‘ahu Implementation
Number of Climate Adaptation Strategy Actions by Implementation Status, as of December 31, 2025
Water Use
Total Water Consumption on O‘ahu, in Gallons Per Capita per Day (GPCD)
Wastewater Reuse
Total Amount of Wastewater Recycled on O‘ahu, in Million Gallons per Day (MGD)
City Tree Plantings
Number of New City Street and Park Trees Planted, per Year
City & Community Tree Planting Locations
Geographic Locations of City and Community Tree Plantings, as of December 31, 2025
The City’s commitment to plant 100,000 trees by 2025—established in 2017—helped catalyze an island-wide effort to expand Oʻahu’s urban tree canopy through both City and community action. While past reporting combined City and community plantings, community data has relied on voluntary reporting and is likely incomplete, particularly in recent years. To provide a more consistent and reliable measure, this chart reflects the number of trees planted by the City annually. The City will continue evaluating future tree planting targets while remaining committed to achieving 35% urban tree canopy by 2035, with ongoing planting as a critical strategy.
O‘ahu Tree Inventory
Geographic Locations of Inventoried Trees on O‘ahu, by Tree Species