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During the week of February 6-10, 2012, some extremely weighty matters were in progress at NIST’s non-magnetic facility, where PML researchers hosted an international gravimeter shoot-out with potentially momentous consequences for the impending redefinition of the kilogram.

For climatologists and environmental policy makers who need to determine the flux of greenhouse gases (GHG), there are three paramount questions: Where is it, how much is there, and how is it moving? A new measurement approach is being developed and tested by a PML research team and NIST colleagues that may provide answers of unprecedented accuracy to all three.