environment

The Coconino National Forest will begin stage II fire restrictions Thursday morning at 8 a.m. It bans all campfires and charcoal and wood stoves, even in developed areas, along with many other fire-causing activities. 

Michael Collier

Next time you pass a mature ponderosa pine, notice its broad plates of orange-red bark etched with black crevices. That thick, puzzle-shaped bark helps the tree survive moderate forest fires by protecting the inside of the trunk from overheating; severe fires though can kill even the thickest-barked trees.


Earth Notes: Edgar Alexander Mearns

Jun 14, 2017
Smithsonian Institution Archives

On a cloudy, windy day in June 1887, Edgar Mearns climbed Mount Humphreys, Arizona's highest peak. Taking shelter behind a pile of stones, he was joined by a broad-tailed hummingbird—a fitting companion for one of America's greatest ornithologists.


Activists Envision a Border Wall Made of Solar Panels

Jun 9, 2017
Paul Mirocha

President Trump has requested prototypes for what he calls a “physically imposing” and “beautiful” border wall. This week in a meeting with congressional leaders he floated the idea of covering it in solar panels. That’s not a new concept. Quite a few people have been working on solar wall designs. Arizona author and ecologist Gary Paul Nabhan says a solar installation would create clean energy and sustainable jobs for the U.S. and Mexico. KNAU’s Melissa Sevigny spoke with him about his vision.


Donald Chavez

A certain type of sheep that had almost slipped from memory is making a comeback in New Mexico. Dahl sheep are believed to have been raised by Spanish settlers about four centuries ago, but the breed was replaced over time by more common ones. 


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