 I'm Sherry Preston, ABC News. Invasive plants and animals threaten Alaska's environment and economy and can spread to new locations by hitching a ride with you. Help prevent the spread of invasive species on your next Alaskan adventure. Play. Clean. Go. Remove all plants, animals, and mud from your boots, gear, and vehicles before entering and leaving recreational areas. Stop invasive species in your tracks. For more information, visit playcleango.org.