In the 19th and 20th centuries, many left their marks on the bark of aspen trees as they traveled through ... south-central Colorado and northern New Mexico, according to Wyoming Archaeology.

Young aspens often don't survive because of factors such as grazing elk, according to a study by Northern Arizona University researchers.

The county is partnering with Minneapolis-based non-profit Neighborhood Forest, which is giving away free trees to 100,000 kids across the United States, including in New Mexico. County officials ...