An uncertain future for metrology? comments and examples

The comments are intended to illustrate the present status of metrology according to its principles and procedures, namely about the definition and meaning of the concept of uncertainty in measurement, and to introduce an alert about discrepancies becoming more frequent in applications assumed to pertain to the frame of metrology but basically violating metrological concepts.Two examples are reported, in details necessary to make clear the sometimes subtle deviations from a correct application of the metrological rules: one case was found inside a recent metrological document: the very definition of uncertainty; the other case is found in a critical determination of the uncertainty of a basic parameter in climate-change evaluation: the uncertainty affecting the Surface Annual Mean Temperature.