I mean jesus christ, it was 2.5 to 7.0 degrees celsius warmer in the arctic for TWO THOUSAND YEARS just 9000 years BP (i.e. a geological blink), and no, we aren't dead from some giant methane burp.
"During the period of maximum forest extension, the mean July temperatures along the northern coastline of Russia may have been 2.5° to 7.0°C warmer than modern."
- Holocene Treeline History and Climate Change Across Northern Eurasia, http://epic.awi.de/4164/1/Mac2000c.pdf