Old tree stumps under glaciers???

I have yet to hear a coherent science based explanation of how is it that the temperature of the world has been rising continuously   for 12000 years, yet as the glaciers around the world retreat, they expose old tree stumps, ranging from 3000 to 8000 years old, spread from Patagonia to Alaska, Iceland etc


In case you missed it, just type “tree stumps glaciers” into google….