Historical Data

Carbon

Geologic Time Scale — Data from proxy measurements

• boron isotope ratios
• carbon isotope ratios
• stomata counting on leaf fossils

Past 400000 years — Data from Antarctic ice cores

Post-industrial (1850–present) — Data from Antarctic ice cores or, since 1959, directly measured at Mauna Loa

 

Temperature

Current data directly measured since 1850; data quality controlled and adjusted, and tabulated by GHCN