Giant dams built to conserve the Colorado River have nearly wiped out nearby native cottonwood trees, causing big ecosystem disruption. Tiny dams built to mimic those built by beavers could bring them ...

With his questing curiosity, Reinhard Stettler got to know cottonwoods. And aspens. And poplars. From their genetic makeup, to his experiments that sparked a hybrid poplar boom in Washington and ...

Giant dams built to tame the Colorado River have nearly wiped out native cottonwood trees along many riverbanks, disrupting local ecosystems. But new tiny dams, built to mimic ones that beavers make, ...