Slide 19 in this series.
Clearly the accuracy and even validity of temperature measurements for the global mean is in question with what we have presented here. Why is there not a greater concern for validity and accuracy? There is no specific answer to this question.
We however must be aware of what dataset is used to make what point as time proceeds.
NEXT: The Climate Science.
A full range of topics on how global temperature works, is reported, adjusted, and some insignts into its accuracy.