On January 22, 2003, the DC Council passed the Urban Forest Preservation Act of 2002. The Act establishes an urban forest preservation program, requires permits for Special Tree removals or replacements, and establishes a Tree Fund to be used to plant trees and defray costs associated with the implementation of this act. The program will provide numerous environmental benefits to the city, including:

• Heat island effect mitigation and reduced energy use
• Better air quality and reduced water pollution
• Quieter and more beautiful neighborhoods

The entire law can be read here*.