In dry, disturbed soil throughout the West, a weedy invader from Eurasia has gained a tenacious foothold. Kochia scoparia, also called poor man’s alfalfa, has slender, gray-green leaves that turn an ornamental orange in autumn. Despite control efforts, this weed springs back relentlessly thanks to its bountiful seed bank.

Armed with shovels, the group turned enough dirt to plant 630 trees and grasses along the Las Vegas Wash, an area that was once submerged and served as a docking area for boats. “This area was 50 feet below Lake Mead,” said Dr. Scott Abella, assistant professor in the School of Life Sciences at UNLV.

Timed to coincide with the 100th anniversary of the National Park Service, the book “Conserving America’s National Parks” by local author Scott R. Abella tells the story of challenges and successes in conservation efforts in the United States’ more than 400 national parks. Illustrated with 247 photos, maps and sketches, the book explores topics such as the return of wolves and panthers to parks, the removal of dams to restore salmon runs, efforts to save trees infected by pests and adaptation to changes brought on by drought, contamination and climate change. Of local interest are sections on Tule Springs Fossil Beds National Monument and the drought’s impact on Lake Mead National Recreation Area. Visit sites.google.com/site/conservingnationalparks.