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Analysis by Niko Kommenda for The Washington Post (Condensed) Updated April 23, 2025 Researchers at the Arbor Day Foundation, the U.S. Forest Service and forestry consultancy PlanIT Geo have mapped tree cover across all urban areas in the country using aerial imagery and artificial intelligence. Their computer model analyzes patterns in color, shape or shadowing to detect tree crowns. Why this issue matters: Blistering summer heat is becoming the new normal. In the largest U.S. cities, the number of heat waves has increased from around three per year in the 1980s to six events per year in the 2020s. Those heat waves are also getting longer and reach higher peak temperatures. Trees can save lives. On a hot summer afternoon, treeless neighborhoods get 8 to 11 degrees hotter than the greenest parts of the same city. Closing gaps in tree cover could prevent several hundred heat deaths per year. Finding space for trees is tricky in growing cities. Four in ten U.S. cities have lost tree cover over the last five years, often to residential development. But experts say it’s possible to build neighborhoods that are both green and dense. Unshaded buildings and roads also keep releasing heat long after the sun has gone down. Researchers say that heat waves damage our bodies much more if they’re not broken up by cool nights. So, where do New Mexico cities fall within the context of other major US Southwestern Cities regarding tree coverage, the local trend, and in comparison to similar cities: CITY % TREE CHANGE SIM CITIES Boise, ID 19.8% +3.1% 12.4% Denver, CO 16.7% -0.1% 6.6% Santa Fe, NM 15.4% +1.7% 12.4% Tucson, AZ 14.6% +4.5% 6.6% Salt Lake City, UT 13.4% +0.4% 16.4% Albuquerque, NM 10.2% +0.3% 9.6% Las Cruces, NM 8.5% +3.0% 7.7% Phoenix, AZ 8.5% -0.2% 8.2% Las Vegas, NV 6.8% +1.6% 9.3% El Paso, TX 4.4% -0.6% 10.1% The good news is that there seems to be a growing trend to add more urban tree coverage, or maybe the trees are just maturing, but the percentage is, for the most part, increasing. Trees add enormously to our well being and enjoyment of the environment. Find places to plant more trees in your upcoming projects and share the many benefits trees bring to us with your project teams.
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