Fast Fact Library

Green roofs can be effective carbon sinks. A two-year, Great Plains-based study found that shallow, lightweight, porous green roof substrate supported improved carbon capture as compared to deeper, denser substrates...

Alam, M.M. Lekhon, Lee R. Skabelund, Charles W. Rice, James S. Lin, and Jaeyoung Ha. “How effective are green roofs as building carbon sinks? Empirical evidence linking substrate, depth, and vegetation dynamics in the U.S. Great Plains.” Journal of Environmental Management 396 (2025). https://doi.org/10.1016/j.jenvman.2025.128117

Forests with five different species of tropical trees can store 36% more carbon in trunks and branches than forests with just one species, as measured by a 16-year study of an experimental forest in Panama.

Schnabel, Florian,  Joannès Guillemot,  Kathryn E. Barry,  Melanie Brunn,  Simone Cesarz,  Nico Eisenhauer,  Tobias Gebauer,  Nathaly R. Guerrero-Ramirez,  I. Tanya Handa,  Chris Madsen,  Lady Mancilla,  Jose Monteza,  Tim Moore,  Yvonne Oelmann,  Michael Scherer-Lorenzen,  Luitgard Schwendenmann,  Audrey Wagner,  Christian Wirth,  and Catherine Potvin. “Tree Diversity Increases Carbon Stocks and Fluxes Above—But Not Belowground in a Tropical Forest Experiment.” Global Change Biology 31 (2025). https://doi.org/10.1111/gcb.70089.

Restored and created tidal marshes had recovered or exceeded the ecosystem services provided by intact marshes after just five years, according to a global literature review of 152 studies. The most significant...

Rowland, Phebe I., Melissa Wartman, Jasmine Bursic, and Paul Carnell. “Restored and created tidal marshes recover ecosystem services over time.”
Environmental and Sustainability Indicators 24 (2024). https://doi.org/10.1016/j.indic.2024.100539

Urban greenery can play a significant role in absorbing atmospheric carbon dioxide. According to a Columbia University study, trees, shrubs, flowers, herbs, and grasses in the five boroughs of New York City...

Wei, Dandan, Andrew Reinmann, Luke D. Schifer, and Roisin Commane. High resolution modeling of vegetation reveals large summertime biogenic CO₂ fluxes in New York City. Environmental Research Letters 17, 12 (2022). https://doi.org/10.1088/1748-9326/aca68f.

Areas of urban forest can contain as much carbon in above-ground biomass as similarly sized areas of tropical rainforest, according to a LiDAR analysis of trees in the London Borough of Camden.

Wilkes, Phil, Mathias Disney, Matheus Boni Vicari, Kim Caleders, and Andrew Burt. Estimating urban above ground biomass with multi-scale LiDAR. Carbon Balance Manage 13, 10 (2018). https://doi.org/10.1186/s13021-018-0098-0.

The monetary benefits of urban trees outweigh their maintenance and other associated costs. In a study of five U.S. cities, each dollar invested in urban trees returned between $1.37 and $3.09 in benefits. Benefits...

McPherson, Greg, James R. Simpson, Paula J. Peper, Scott E. Maco, and Qingfu Xiao. (2005). Municipal forest benefits and costs in five U.S. cities. Journal of Forestry 103(8), 411-416.

Carbon sequestration rates are up to 90 times greater for healthy large trees than healthy small trees. In Chicago's urban forest, a typical 3-in diameter tree sequesters approximately 2.3 lbs annually, which is...

McPherson, Gregory E., David J. Nowak, Rowan A. Rowntree. (1994). Chicago’s Urban Forest Ecosystem: Results of the Chicago Urban Forest Climate Project. USDA Forest Service Northeastern Forest Experiment Station General Technical Report NE-186, 63-81.