Sony joined Climate Savers in July 2006.

Climate Savers is a program that partners the WWF (World Wide Fund for Nature)^*1 with companies to plan and carry out efforts to reduce greenhouse gas emissions using a variety of methods.

Companies emit large amounts of CO₂ in the course of producing and processing their products, transporting them, doing office work, and other activities. In Japan, business and the public sector are said to emit approximately 80% of total emissions. The WWF therefore started the Climate Savers program in 2000 in the conviction that active efforts by companies to reduce greenhouse gas emissions would be a key to preventing global warming.

Climate Savers companies set objectives that carry their environmental measures a step further than the efforts those companies had been making on their own. It is a condition of the program that the specific target values for greenhouse gas reduction a company sets must be absolute values rather than emissions per basic unit. The WWF and a third-party organization verify whether target values have been achieved.

One of the most distinctive features of Climate Savers is the way it reinforces a company's autonomy and links it to credibility and transparency. As of March 2007, there were 12 companies from a variety of business categories participating in this program around the world.

^*1 The WWF (World Wide Fund for Nature), which operates in about 100 different countries, is the world's largest non-governmental organization (NGO) for natural conservation. It aims for the coexistence of human beings and nature through a wide variety of activities that protect nature around the world, ranging from the conservation of ecosystems to the prevention of global warming.