There is no rule that says natural occurnces cannot accelerate or that they proceed in a uniform time frame...on the contrary. One thing i will say is that marine organisms are remarkably resilient and i mean in a way that is difficult to fully believe...just wanted to point that out but there are no guarntees. Marine Life Survived 8X Current CO2 Levels, but that is a dire situatione nonethe less. Some specimens of their respective species seem to withstand more. So just pointing out there is some buffer in respect to bounce back.