I like this data: https://gcmd.nasa.gov/KeywordSearch/Metadata.do?Portal=amd&KeywordPath=%5BKeyword%3D%26%23039%3BCH4%26%23039%3B%5D&OrigMetadataNode=GCMD&Entr

I like this data: https://gcmd.nasa.gov/KeywordSearch/Metadata.do?Portal=amd&KeywordPath=%5BKeyword%3D%26%23039%3BCH4%26%23039%3B%5D&OrigMetadataNode=GCMD&EntryId=EARTH_LAND_NGDC_PALEO_VOSTOK1&MetadataView=Full&MetadataType=0&lbnode=mdlb5 https://gcmd.nasa.gov/KeywordSearch/Metadata.do?Portal=amd&K... And from there: https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/ice-core https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/... And a Wiki article discussing it: https://en.wikipedia.org/wiki/File_talk:Vostok_Petit_data.svg https://en.wikipedia.org/wiki/File_talk:Vostok_Petit_data.sv... Where this chart is interesting: https://en.wikipedia.org/wiki/File_talk:Vostok_Petit_data.svg#/media/File:Vostok_Petit_data.svg https://en.wikipedia.org/wiki/File_talk:Vostok_Petit_data.sv...