Follow the Cat Scan team as they cover Mount Lemmon.

A Cat Scan team and students from a beginning journalism course covered Earth Day events on the University of Arizona's campus, from a climate conversation to a campus block party. Scroll over and click on the images on the globe to read the stories.

Artists and community members gather on the dry, sandy bed of the Rillito River to draw attention to the disappearing rivers in the Southwest by playing live music and hosting other live performances. And once a year, they go there to hold a festival and watch 45,000 bats fly out from under a bridge.

Cat Scan reporter Brian Greer spent a day riding in the passenger seat of a garbage truck with driver Daniel Domínguez.