The actions of one faculty (University of East Anglia’s Climate Research Unit ) if true reflect that universities data and findings not the methodology and approach and honest scientific approach of the thousands upon thousands of researchers else where.
The problem with the climate issue is there are a huge number of data sets, recorded from thousands of locations from hundreds of data sources, i.e. daily/weekly/monthly/annual/etc air temp, sea temp, isotope and records from ice / soil core records and hundreds of thousands of scientists all with their own ideas.
The major problems with identifying trends and climatic model are that much of the data is conflicting and that on the whole they over tiny time scales or in the case of the longer period isotope ratio modelling and sediment / rock records a snap shot of the climate in time.
At the end of the day the climate is a multiple force feedback system with controls and influences that are still not fully understood and is in part governed by something akin to chaos theory, along with the Milankovitch cycles of the earth (periodicity etc) Solar output, etc etc.
Until all of the evidence is collected, collated and looked at as a whole and then used to create a model that can fully reflect the climatic systems and interactions you can not dismisses the possible implications if the the climate is shifting. Unfortunately the shear number of variables will pretty much make modelling such a vast system unviable.