The Bulletin of the Atomic Scientists has published a doomsday clock for nuclear war for decades. The minute hand has been at two minutes to midnight for several years too, I believe. The trouble with going full-tilt for panic too soon is that one can't get closer without resorting to Eleatic micro and pico-second intervals. If people establish a Doomsday clock for Global Warming it should not be at the panic place initially- give a little space to take note of worsening conditions.
https://thebulletin.org/doomsday-clock/current-time/
Maybe these guys;The Union of Concerned Scientists have published a doomsday clock somewhere.
https://scitechdaily.com/scientists-warn-nine-climate-tipping-points-now-active-could-threaten-the-existence-of-human-civilization/
https://blog.ucsusa.org/peter-frumhoff/global-warming-fact-co2-emissions-since-1988-764
https://www.forbes.com/sites/rrapier/2018/06/29/global-carbon-dioxide-emissions-set-new-record/#434893a743a9
https://thebulletin.org/doomsday-clock/current-time/
Maybe these guys;The Union of Concerned Scientists have published a doomsday clock somewhere.
https://scitechdaily.com/scientists-warn-nine-climate-tipping-points-now-active-could-threaten-the-existence-of-human-civilization/
https://blog.ucsusa.org/peter-frumhoff/global-warming-fact-co2-emissions-since-1988-764
https://www.forbes.com/sites/rrapier/2018/06/29/global-carbon-dioxide-emissions-set-new-record/#434893a743a9