Lehet hogy nem hamisitvany, de legalabbis vitatott...

http://cfa-www.harvard.edu/press/pr0310.html

"Cambridge, MA - A review of more than 200 climate studies led by researchers at the Harvard-Smithsonian Center for Astrophysics has determined that the 20th century is neither the warmest century nor the century with the most extreme weather of the past 1000 years. The review also confirmed that the Medieval Warm Period of 800 to 1300 A.D. and the Little Ice Age of 1300 to 1900 A.D. were worldwide phenomena not limited to the European and North American continents. "

Azaz a 20. szazad sem a legmelegebb, sem a legszelsosegesebb idojarasu nem volt az elmult 1000 evben.