Alaskan Trees Record Global Warming
Alaska has one of the highest rates of recent temperature increase in the world. Tree-ring records of summer temperature changes span nearly all of the last millennium at the Firth River in northeastern Alaska.
The warmest epoch in the last nine centuries occurs during the 20th century, with average temperatures over the last thirty years approximately 1.2 ± 0.16° C (about 2.5° F) warmer than the long-term average (1100 to 1850 CE).
northwestern North America during the last nine centuries, J.
Climate, in review