> We are now saying this window has closed, but we can open it again by making the overshoot as brief as possible

Not holding my breath.

It would require relentless global catastrophe to move humans globally. And even then many would dig in and resist.

The spotty nature of climate impact on a globe wide scale will likely never allow a shared assessment of risk.

Not to mention the need for most of humanity to stick to a plan over sufficiently long timescales.