2000 to 2009 was the warmest decade since records began . 2005 was warmest year of all time , 2008 coolest in decade . In the past three decades , GISS report surface temperature records show an upward trend of about 0.2 degrees Celsius ( 0.36 degrees Fahrenheit ) per decade . The only thing that has changed is we have a lot more people living on this planet and they are using less energy per person than ever before.
2000 to 2009 was the warmest decade since records began . 2005 was warmest year of all time , 2008 coolest in decade . The only thing that has changed is we have a lot more people living on this planet and they are using less energy per person than ever before.