The table below represents the temperature changes from the 20th century average and the C02 concentration (ppm) since 1960. When the information is plotted on the same graph, it shows a strong positive correlation.
| Year | 1960 | 1964 | 1968 | 1972 | 1976 | 1980 | 1984 | 1988 | 1992 | 1996 | 2000 | 2004 | 2008 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CO2 (Parts per million) | 318 | 320 | 322 | 326 | 332 | 338 | 345 | 350 | 355 | 359 | 368 | 375 | 383 | Temperature changes from 20th century average | 0.05 | -0.1 | 0.02 | 0.05 | -0.08 | 0.25 | 0.13 | 0.3 | 0.25 | 0.3 | 0.44 | 0.57 | 0.5 |