With the 40th Earth Day celebration going on around the world, commentator Rosie Dempsey finds herself thinking about some old friends from childhood: trees.

Tread lightly... And, thanks for talking trees to: Henderson Urban Forester, Lisa Ortez; Las Vegas Arborist Dennis Schwartzel; Las Vegas Office of Planning, Flynn Fagg; Desert Studies Center Biologist Rob Fulton; UNCE Orchard, Fred Landau; University of Nevada Master Gardeners: Angela O'Callahan and Richard Liefred.

More on News 88.9 KNPR:

• The Water Line of Earth Day
• Earth Day

• American Forests' Green Calculator: Size up your carbon footprint
• Climate Change Calculator
• Earthday.org: Events and info. around Nevada, U.S.
• Master Gardeners: Tree-pruning advice; ask about the free mulch, and fruitwood for grilling: 702-257-5555.
• NPR: Earth Day: Over the Hill and Still Hot
• Southern Nevada Arborists
• The Atlas of Global Conservation: Zoom into Nevada on US/World tree maps
• Trees and the West: Some Factoids:
  • The National Arbor Day Foundation plans to name Las Vegas as a Tree City USA, marking the 18th year that the city of Las Vegas will receive the award.
  • Nevada ranks 11th in the nation for biologically diversity and 3rd for at-risk species.

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