Discussion of: A statistical analysis of multiple temperature proxies:   Are reconstructions of surface temperatures over the last 1000 years   reliable?
  Discussion of "A statistical analysis of multiple temperature proxies: Are reconstructions of surface temperatures over the last 1000 years reliable?" by B.B. McShane and A.J. Wyner [arXiv:1104.4002] 
Murali Haran, Nathan M. Urban
stat.AP