Trees have become critical infrastructure in cities, providing shade, filtering air pollution, and absorbing rainwater. While cities need to plant more trees, it shouldn't just be any trees but those resilient to climate change according to experts. “You need a tree that’s going to survive the weather of today and the climate of the future,” said Pete Smith, urban forestry program manager with the Arbor Day Foundation. Experts are looking at trees that can tolerate droughts, storms, flooding, and heat. But they are also putting emphasis on diversity after many cities "...lost vast amounts of their tree canopy because they relied too heavily on one tree type that was later wiped out."