Carbon Dioxide Information Analysis Center , U.S. Department of Energy (DOE)
This site from the Carbon Dioxide Information Analysis Center features a graph of CO2 levels in entrapped air from the Vostok Ice-Core.
Subject: Geoscience:Atmospheric Science:Climatology , Geoscience:Atmospheric Science Resource Type: Scientific Resources:Research Results, Datasets and Tools:Datasets Topics: Climate, Atmosphere Data Source: Observational Data Data Derived: Data Derived