There seems to be a competition for the most idiotic hockey stick.
The 1990 IPCC report showed that temperatures were much warmer 5,000 years ago.
Evidence for this includes Arctic sea ice.
Less Ice In Arctic Ocean 6000-7000 Years Ago | ScienceDaily
ftp://osisaf.met.no/prod_test/ice/index/v2p2/nh/osisaf_nh_sie_daily.txt
Arctic temperatures.
Holocene Treeline History and Climate Change Across Northern Eurasia – ScienceDirect
Latitude and elevation of tundra
