Assignment Earth: Sustainable Winter Agr...

  Making the growing season grow longer, that’s the idea for Daphne Yannakakis, an organic farmer in western Colorado. Along with husband Don Lareau on Zephyros Farm, they’re growing vegetables in wintertime as part of a study by Colorado State University. The vegetables grow under the protection of unheated green houses called high tunnels, which hold in heat stored by the...

Tree Fight: Cititzens on the front line ...

A love of backcountry skiing explains David Gonzales’ obsession with white bark pines. A writer and photographer, he spends a lot of time beneath these ancient trees. But the white barks are under attack. And that has this skier marshaling forces to fight back. Once the snow melts, he leads volunteers called Tree Fighters into the forest surrounding Yellowstone National Park. Tree...