#Collapse Likelihood: 40% probability of widespread #dieback if warming reaches 2.0^{C}. Trigger: Combined #deforestation exceeding 22% and regional rainfall reduction of 30%. Impact Mechanism: Release of up to 90 billion tons of #carbon, potentially adding 0.3^{C} to #global warming.
During the 1990s #ash #dieback, caused by Hymenoscyphus fraxineus, has spread from Asia to Europe where it can cause up to 85% mortality of ash trees during outbreak - review of the disease with focus on the history of the disease and management efforts in Britain and Ireland in the journal "Plant Pathology" by Dáire Carroll and Eric Boa - https://doi.org/10.1111/ppa.13859
Could Humans Survive the Dinosaur-Killing Asteroid? Featuring @LEMMiNO

YouTube

5/

- "Consequently, this would result in a #dieback of substantial parts of the #rainforest" [1]

#References

[1] Bochow, N., Boers, N., 2023. The South American monsoon approaches a critical transition in response to deforestation. Science Advances 9 (40), eadd9973+. https://doi.org/10.1126/sciadv.add9973

[2] Sierra, J.P., Junquas, C., Espinoza, J.C., Segura, H., et al. 2022. Deforestation impacts on Amazon-Andes hydroclimatic connectivity. Climate Dynamics 58, 2609–2636. https://doi.org/10.1007/s00382-021-06025-y

#DOI

4/

The authors [1] conclude

- "After the #dieback of the #rainforest, the soil moisture approaches an #alternative #equilibrium consistent with the reduced #precipitation and #evapotranspiration of the #savanna vegetation"

- "At the #CriticalPoint, the atmospheric moisture content does not suffice anymore to maintain precipitation and, thus, latent heating rates that could switch the system back into the annual wet season, resulting in a permanent dry season state"

To highlight just one aspect of the many important results: Compared to the ‘no overshoot’ case, a temporary CO2 overshoot results in 10% higher global mean #SeaLevelRise in 2100, that keeps increasing over centuries thereafter.

Further findings relate to #ocean circulation, #permafrost, #fires, #landuse, #CDR, #coral #dieback, #economic #risks and #damages, lifetime #extreme event exposure (see below) & more.

https://twitter.com/wimthiery/status/1653404029404291073

Wim Thiery on Twitter

“What does overshoot mean for Children worldwide? Today's newborns will experience up to 25% more scorching heatwaves across their lifetime if 1.5°C is reached after an overshoot by 0.35°C: *x5 instead of x4*. Our new paper in @IOPenvironment led by @NB_pik https://t.co/E9FjrA8jqq”

Twitter
The habitat of small endangered #mammals such as bandicoots is at risk from #dieback.
"The antechinus, the little pygmy possums, the potoroos and bandicoots, they actually live in our grass trees. When [the trees are] killed they've got no #habitat."
https://www.abc.net.au/news/2023-01-10/plant-disease-phytophthora-dieback-trial-endangered-species/101787108
#Phytophthora #driving #walking #pathogens
Halting spread of introduced plant disease Phytophthora dieback vital to saving iconic threatened species

A pathogen branded a "biodiversity bulldozer" is the second biggest threat to native flora and fauna after rabbits but has not received the same attention as other pests. A new trial aims to change that.

ABC News
Going through preliminary #analysis of my field data from #Somaliland. The black dots are the locations of dead #juniper #trees at my #field site, which is located in an area that has been experiencing #dieback (red shade), and borders an area that has been rehabilitated through #soil and #water conservation (green shade).