Nike's Better World initiative looks at how Nike promotes sustainability practices as well as the benefits of sports around the world. As part of this initiative, Nike has a Materials Sustainability Index (MSI). The MSI is a tool used to help product teams select environmentally better footwear and apparel materials from better suppliers. The index's scoring system evaluates the environmental impacts of materials used in products using a combination of materials-specific data. It tracks impacts such as Chemistry, Energy and Greenhouse Gas Intensity, Water and Land Use Intensity, and Waste. The API provides access to data such as listing of materials, matching materials, material search via keyword and more. It uses RESTful calls and responses are formatted in JSON or HTML.