So when the CRU says they only have the "value-added (quality controlled and homogenised) data" on climate change, its important to have a picture of what their adjustments looked like.

I'm sure its just an amazing coincidence that the adjustments to the temperature data got bigger and bigger over the last few decades of the 20th century, perfectly mirroring the ultimate results of their climate study.

So, in total, they've found that temps in the continental US have risen .6 degrees from 1940 to now. Of that, .1 degree is based on actual measured rises in temperatures and .5 degrees is due to these "value-added (quality controlled and homogenised) data" adjustments.

Taken directly from the United States Historical Climatology Network (USHCN).

The cumulative effect of all adjustments is approximately a one-half degree Fahrenheit warming in the annual time series over a 50-year period from the 1940's until the last decade of the century.

But move along, the science is settled.