The Reference Frame: Nixon was told: sea level would rise by 10 feet in 31 years

So you may see that the "temperature increase per CO2 increase" - a linearized version of climate sensitivity - was only overestimated by the factor of 13/1.8 = 7.2, i.e. by 620%, less than 1200% for the temperature increase itself.

And the sea level rise per temperature increase was only overestimated by a factor of 30.5/13 = 2.35 i.e. by 135%, well below 2950% of the sea level itself.