Chase Choate beamed as he explained the plan for the morning. The goal was to plant 700 trees before noon. The cottonwoods and willows, Choate said, would be pretty straightforward. The honey mesquite ...

On a recent Wednesday, the garden at Tucson's south-side food bank was abuzz with activity, as volunteers hauled gravel, transplanted saplings and pulled weeds in the warm morning air. Most of the ...