The document discusses sustainable supply chains and the challenges that businesses face in achieving fully sustainable supply chains. It notes that a sustainable supply chain would safeguard the environment and human rights, follow international standards, engage suppliers on social and environmental issues, and have a net positive impact. However, no company yet has a fully sustainable supply chain, as most impacts occur lower in tiers of suppliers. Working to address issues in lower tiers can be difficult and expensive. Traceability, transparency, and government action to create a level playing field for companies are seen as important steps, but full sustainability may not be achievable by targeted dates of 2020, 2025 or 2030.