Longest and most unusual of the current Era of interglacials. Insolation barely dropped below 440 W/m2 before increasing again. That kept the interglacial going much longer than normal. This interglacial was the longest warm period the Earth has had in millions of years. Instead of the normal large drop in insolation it had two weaker peaks, but a very shallow drop that barely dropped below 440 W/m2. That meant a long period without any low NH insolation. The Earth responded with temperatures that were as warm as today for ~20,000 years.
