<http://schema.org/about>
"How can I lessen my pets' effect on the environment? Spay/neuter, compost or bury pet waste, eco-friendly cat litter and kitty litter"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/family/pets/questions/how-can-i-get-my-pets-on-the-green-track>