Graham Hancock on younger dryas: what the evidence says · JRE #2136
SUBJECT: YOUNGER DRYAS
Not a true/false call. Every claim is logged with its sources; read the exhibits below.
Between 12,900 and 12,800 years ago, a very dramatic climate episode occurred and that's called the Younger Dryas. The world had been gradually warming up before that. And then suddenly, it went very, very cold. There is evidence of a six-meter sea level rise at exactly that time, which is very hard to explain.
What the evidence says 01 / RECORD
The core chronology is accurate: the Younger Dryas began about 12,900 cal BP (12.9 plus or minus 0.1 ka) as an abrupt cooling of decades that reversed the preceding deglacial warming. The sea-level framing is misleading. The six-meter figure traces to the Barbados coral record (Abdul et al., 2016), but that study places the 6 m of rise across the entire roughly 1,300-year Younger Dryas interval at a decelerating rate (from about 20 mm/yr in the mid-Allerod down to under 4 mm/yr), not as a sudden jump at the onset. The same study explicitly found no meltwater pulse at the initiation of the Younger Dryas and describes a slowdown, not a hard-to-explain surge. Later sea-level history around this interval remains contested: a 2025 Great Barrier Reef study finds the following Meltwater Pulse 1B did not exceed roughly 10.2 to 7.7 m and does not support the Barbados record of an abrupt greater-than-11 m step.