The scientific community is now unanimous, the global climate is changing. Global temperatures are rising and precipitation patterns are changing. The observation of data over the past 100 years clearly shows that the climate is heating up. Between 1906 and 2005 the global mean temperature rose by 0.74 °C. The earth's average temperature is estimated to rise by 1.4 to 5.8°C between 1990 and 2100.