Fig. 2. δ¹³C of leaf waxes (δ¹³C_wax) in the Gulf of Aden core for the past ca. 900 years (in green) versus the change in atmospheric CO₂ δ¹³C (42).

Note that although the absolute values are different, the relative scales are equivalent. The recent decrease in δ¹³C_wax resembles the record of atmospheric CO₂ δ¹³C both in timing and in magnitude, indicating that δ¹³C_wax records the Suess effect.