levels much more quickly than previously projected. "We're in danger of handing young people a situation that's out of their control," according to James E. Hansen, the leader of a number of climate scientists who worked together to compile the study. In 2018, scientists concluded that high sea levels some 125,000 years ago, which were 6–9 m (20–30 ft) higher than today, were most likely due to the absence of the WAIS, and found evidence that the ice sheet collapsed under climate conditions similar to those of today. In 2021, these modeling improvements were represented in the IPCC Sixth Assessment Report, where the end-of-century Antarctic sea ice loss is much more aggressive, and contribution from ice sheet collapse processes is now included in the 5-95% range. It now estimates that under the SSP1-2.6, which corresponds to the Fifth Report's RCP 2.6 and includes aggressive mitigation and is largely in accordance with the goals of the Paris Agreement, the median sea level rise contribution from the Antarctica is around 11 cm, with a likely (17-85%) range of 3 to 27 cm, and only the very likely (5-95%) range includes the chance of an 1 cm reduction to sea level rise, which is as likely as a 41 cm increase in sea levels due to ice sheet collapse going well underway. Under the "moderate" SSP2-4.5 scenario, the figures are very similar, as winter precipitation over the ice sheet rises in tandem with increased ice loss from the atmospheric and ocean warming: the median estimate is also 11 cm, with a likely range of 3 to 29 cm, and the very likely range of -1 to 46 cm. However, increases in precipitation can no longer keep up with or outpace the increased ice sheet breakdown if the emissions increase indefinitely under SSP5-8.5: its median contribution is 12 cm, with a likely range of 3 to 34 cm, and the very likely range of 0 to 57 cm. It had also cited the limited-confidence (based on just three studies) predictions of the earlier IPCC SROCC about sea level rise by the year 2300: it suggested that sea level rise contribution would not go much further beyond the 2100 levels under the 2.6 scenario (16 cm median, 37 cm maximum), but would accelerate to a median of 1.46 metres (with a minimum and a maximum of 60 cm and 2.89 metres) under the 8.5 scenario.