the warmest decade was decade since records began . 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 . 2005 was warmest year of all time , 2008 coolest in 2000 to 2009 . Global temperatures have risen about 0.8 degrees Celsius since decade .
the warmest decade was decade since records began . 2005 was warmest year of all time , 2008 coolest in 2000 to 2009 . Global temperatures have risen about 0.8 degrees Celsius since decade .