Which statement about urban trees and microclimates is most accurate?

• A. Trees have no effect on urban heat.
• B. Trees only affect aesthetics, not climate.
• C. Trees can create cooler microclimates and reduce stormwater runoff.
• D. Trees worsen stormwater issues.

Answer: (C)

Trees influence urban microclimates by providing shade that reduces heat absorption and through evapotranspiration, where they release water vapor to cool the surrounding air. In cities, these effects help lower surface temperatures and counter the urban heat island effect. They also intercept rainfall with their canopies and promote infiltration in the soil with their roots, which decreases the volume and rate of stormwater runoff. So, trees can create cooler microclimates and reduce stormwater runoff.

Choices that claim no effect on heat, or that trees only affect aesthetics, ignore these cooling and hydrological benefits. The idea that trees worsen stormwater issues overlooks how interception and infiltration typically mitigate runoff.