The document discusses developing a methodology to calculate the carbon footprint of museum loans. It outlines measuring the greenhouse gas emissions from various components of loans like packing, wrapping, transport, and couriers. A pilot study was conducted that calculated the carbon footprint of loans from the National Museum Wales in 2006 was 53 tonnes of CO2. Recommendations are provided to reduce the carbon footprint of loans such as reusing materials, using more efficient transport methods, and better planning of exhibition routes.