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A Sacramento County study found that city-wide maximum mid-day air temperature reductions due to the shading and evapotranspiration of trees are in the range of 0.04°C to 0.2°C per percent canopy cover increase.

Simpson, James R. (1998). Urban forest impacts on regional cooling and heating energy use: Sacramento County case study. Journal of Arboriculture, 24, 201-214.

An experiment with 160 college student participants suggested that driving through forested scenery may help reduce stress from previous stressors and reduce stress response to subsequent stressors.

Parsons, Russ, Louis G. Tassinary, Roger S. Ulrich, Michelle R. Hebl, and Michele Grossman-Alexander. (1998). The view from the road: Implications for stress recovery and immunization. Journal of Environmental Psychology 18(2), 113–140.

Simulations of the impact of tree shade on residential air conditioning in California showed that three shade trees (two on the west, one on the east side) could reduce a home's annual energy use for cooling by 10...

Simpson, James R., and E. Gregory McPherson. (1996). Potential of tree shade for reducing residential energy use in California. Journal of Arboriculture, 22(1), 10-18.

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.

Findings from monitoring and computer simulations suggest that a single 25-ft tall shade tree can reduce annual heating and cooling costs of a typical residence by 8-12% ($10-25).

McPherson, E. Gregory, and Rowan A. Rowntree. (1993). Energy conservation potential of urban tree planting. Journal of Arboriculture 19(6), 321-331.

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