A blockbuster Chinese study of Tibetan tree rings by Lui et al 2011 shows, with detail, that the modern era is a dog-standard normal climate when compared to the last 2,500 years. The temperature, the rate of change — it’s all been seen before. Nothing about the current period is “abnormal”, indeed the current warming period in Tibet can be produced through calculation of cycles. Lui et al do a Fourier analysis on the underlying cycles and do brave predictions as well.

http://whatreallyhappened.com/node/147525