Based on radiocarbon dating of the fossil wood remains of eight larch (Larix decidua) stem fragments found one meter beneath the surface of the ground at the base of the front of the Piancabella rock glacier (46°27'02" N, 9°00'07" E) in the Southern Swiss Alps in September 2005, the authors determined that the wood was formed somewhere between AD 1040 and 1280 with a statistical probability of 95.4%. Then, based on this information and "geomorphological, climatological and geophysical observations," they inferred that "the treeline in the Medieval Warm Period was about 200 meters higher than in the middle of the 20th century, which corresponds to a mean summer temperature as much as 1.2°C warmer than in AD 1950." Thus, we assign the MWP (at a minimum) to the period AD 1040-1280; and adjusting for warming between 1950 and the present, we calculate that the MWP was about 0.5°C warmer than the peak warmth of the CWP.
This confirms that the Medieval Warm Period was warmer than today. Obviously the world did not end.