Green marketing generally refers to efforts that focus on promoting products and services that have a reduced environmental impact. For example, a business switching from plastic to glass packaging might use green marketing to tout this improvement. Sustainable marketing focuses more broadly on the entire supply chain of the product or service. Businesses may try to address all types of sustainability, not just environmental, in their marketing. Sustainable marketing can also refer to marketing campaigns that are themselves sustainable or environmentally friendly. For example, a business might have a digital-only marketing campaign that reduces the waste associated with direct mail.