The article explores the implementation and enforcement of corporate climate policies along international supply chains by means of contractual cascading and international commercial arbitration. EU law (in particular the Corporate Sustainability Reporting and Due Diligence Directives) and the ever-increasing stakeholder pressure (climate litigations and greenwashing allegations harming the companies’ reputation and business are on the rise) impel more and more supply chain leading companies to intensify their supply chain–related due diligence mechanisms in relation to environmental, social and governance (ESG) topics. Due to extraterritorial effects, ESG-related EU law will have a direct or indirect impact on non-EU entities and Belt and Road Initiative (BRI)-related projects as well. The article stresses the need for climate-related contractual provisions and discusses the construction of such clauses for supply chains. Due to the nature of international supply chains (the article highlights the construction and automotive industry) characterized by multiple parties, contracts and tiers of subcontractors and suppliers, the enforcement of corporate climate policies will most likely lead to multi-party disputes. In this context, the article addresses the joinders of additional parties and the consolidation of several pending climate-related arbitrations and compares the arbitration rules of the International Chamber of Commerce (ICC), Singapore International Arbitration Centre (SIAC), Hong Kong International Arbitration Centre (HKIAC), London Court of International Arbitration (LCIA) and some of the most important Chinese arbitration institutions. The article answers the question concerning what arbitration rules allow forced joinders and consolidations against the objection of a party. Last but not least, the article emphasizes some China-related specifics in the context of consolidations and joinders in order to avoid invalid arbitration agreements and the non-recognition and non-enforcement of foreign arbitral awards in China.