As temperatures rise, extremely high temperatures and very heavy rainfall are becoming more frequent occurrences in various parts of the world. Unless measures to curb global warming are implemented, during the next 100 years the average temperature is expected to increase by 2.6-4.8 degrees Celsius and the average sea level is expected to rise by 45-82 cm. Doing nothing is simply not an option. As an environmentally advanced nation, Japan needs to demonstrate leadership in preventing global warming.