One of the challenges scientists face in reconstructing the composition of the atmosphere in Earth is geological history Lack of available samples In recent years  alot of people are starting to look at Amber and they think that compared to other organic materials  The chemical and isotopic information preserved in amber has remained almost unchanged over the long geological age
Because the inside of amber often retains a raw shape  Because the inside of amber often retains a raw shape
 So it could be used to show the global atmospheric composition at different times