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- What is the horizontal axis showing, and what is the range of values? Years range from 1960-2010
- Is present day on the right, or the left? present day is on the right
- What is the vertical axis showing, what are the units, and what is the range of values? mean carbon dioxide levels, ppm , range=320-380
- The graph was created from data that was gathered. Does the web page state where the data came from?Historical CO2 Records from the Law Dome DE08, DE08 - 2, and DSS Ice Cores : 1010 A.D.to 1975 A.D.
