Green Economy

The Global Calculator (Japanese version)

The Global Calculator is a model of the world’s energy, land and food systems that allows users to explore the options for reducing global emissions to 2050, and to see the climate consequences of these choices to 2100. It is a free, interactive and open-sourced tool that helps the user to understand the link between lifestyle, energy use, and the consequences for the climate.

The Global Calculator is aimed at anyone interested in exploring what a low-carbon world could look like, but may particularly be of interest to the people working in business, government and NGOs or university students. The Global Calculator has been developed by the UK Department of Energy & Climate Change (DECC) in cooperation with an international team from many organisations.

The basis of the Global Calculator model is an Excel spreadsheet, which links with a more user-friendly, web-based interface. The full Excel model is available to download so that you can examine how it works and the assumptions that have been used. It is a relatively simple engineering-based scenario model, which means that:

  • it models the world’s energy supply and demand by modelling physical units such as land, cars and power plants
  • the user chooses the characteristics, deployment and use of these different technologies
  • it makes no economics-based assumptions about the way people’s behaviour changes in relation to supply and demand
  • it doesn’t automatically optimise the energy system based on price or any other factor.

The Global Calculator is increasingly drawing attention from researchers, policymakers and the general public. Its popularity led the developers to make it available in several languages: English, Chinese, Bahasa, Portuguese, French, and Spanish. Building upon the experience of the development and application of the Japan 2050 Low Carbon Navigator (the Japanese version of the 2050 Pathways Calculator), developed by the Institute for Global Environmental Strategies (IGES) jointly with the National Institute for Environmental Studies (NIES), and taking into consideration the significance of the Global Calculator in understanding the world’s long-term climate scenarios, in 2015 IGES, with the financial support from the Ministry of the Environment of Japan (MOEJ) and the technical assistance from the UK DECC, initiated translating the tool into Japanese. It is believed that the Global Calculator in Japanese language, together with the Japan 2050 Low Carbon Navigator, will be very useful for awareness raising and educational purposes as well as for engaging in informed dialogues on climate change-related issues facing the world and Japan. Global Calculator in Japanese language is now available


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