Business requires trust and integrity between partners in the supply chain. Sustainability relates to the degree of concern for the environment, including use of renewable resources and minimization of harmful waste. Ethics relates to alignment with legal and moral codes of conduct in all activities of the firm. This can be particularly challenging in a global company, as legal and moral codes may differ significantly across cultures and geographies. In some cases there may be prescribed processes to help ensure ethical dealings, such as those embodied in the Sarbanes-Oxley act of 2002 in the United States. Social responsibility relates to the areas of sustainability and ethics as they pertain to the communities where the organization does business. It further extends into how the organization supports its communities and encourages its workers to follow suit.