graphhh

1. What is the horizontal axis showing, and what is the range of values? Years range from 1960-2010
2. Is present day on the right, or the left? present day is on the right
3. 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
4. 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.