The estimate for the climate sensitivity was 1.5 to 4.5 °C; and the average temperature was predicted to increase by 1.4 to 5.8 Celsius degrees between 1990 and 2100, and the sea level was predicted to rise between 0.1 and 0.9 meters. The range of predictions is based on different levels of human carbon dioxide production. Each perdiction has different possible outcomes.