[MrGLaDOS]

Multiple groups are. Albeit for insects and coral reef, not for humans.

https://www.theguardian.com/environment/2019/feb/10/plummeti...

https://www.pnas.org/content/pnas/105/37/13736.full.pdf

[makerofspoons]

There are researchers starting to connect the dots on near-term human extinction. A good summary is 'The Uninhabitable Earth' by David Wallace-Wells: http://nymag.com/intelligencer/2017/07/climate-change-earth-...