Discover and read the best of Twitter Threads about #ar5

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👏 Congratulations to the entire @IPCC_CH #WGI team!

📣The final #AR6 #WGI report📘, including the concise draft Summary for policy makers, has been completed on time⏱️.

I am very proud of the outcome!

🙏The impressive dedication of everyone was critical to complete a rigorous, exhaustive, objective & transparent assessment of the state of climate science knowledge, with many novel aspects, and with the highest quality standards, despite challenging circumstances 😷.

This was made possible by the 🔹amazing 🔹WGI Technical Support Unit!

Kudos to @anna_pirani @Clo_Pean @connorsSL @leahgoldfarb Yang Chen @georobin @MelichatGo @SoBrgr Rong Yu Baiquan Zhou @OzgeYelekci @NadaCaud @leitzell Mengtian Huang @LonnoyE @TMWaterfield

Read 6 tweets
Recent @IPCC_CH reports had assessed the state of scientific knowledge related to fire and climate change.
For instance, the Australasia WGII #AR5 report (2014) had very clear conclusions on vulnerability to intense bushfire and observed and projected increase in fire weather for southern Australia.
Full chapter 25 available here :
There was a dedicated box on climate change and fire, and it was also mentioned in a Frequently Asked Question on key risks from climate change to Australia
Read 12 tweets
This has not changed from earlier #IPCC assessments (like #AR5 or #SR15), but, not surprisingly, trade-offs with other forms of land-use are better highlighted in #SRCCL
All mitigation pathway archetypes for 1.5-2 °C (RCP1.9/2.6) include large volumes of carbon dioxide removal, even the very optimistic Pathway 6 that excludes engineered CDR (represented by BECCS) but relies on a large land sink… (ch 2.6.2) #SRCCL
Cumulative CDR volumes by 2100 for these 6 archetype mitigation pathways are quite high
P1: 395 Gt BECCS + 73 Gt Afforestation
P2: 466 Gt BECCS + 117 Gt AF
P3: 944 Gt BECCS only
P4: 300 Gt BECCS + 428 Gt AF
P5: 252 Gt BECCS + 128 Gt AF
P6: 124 Gt AF only
Read 5 tweets
#Lomborg krijgt opnieuw 2 pagina's in @demorgen om twijfel te zaaien over het nut van klimaatbeleid. Draadje met de belangrijkste bezwaren. @jdceulaer @barteeckhout
De kern van Lomborgs redenering is nogal paradoxaal: de klimaatopwarming afremmen zal niet lukken, ook niet met het klimaatakkoord van Parijs, maar dat is ook niet zo erg. De mens kan zich aanpassen aan de opwarming.
Hij haalt ter staving z'n fel bekritiseerde studie aan: die komt tot minieme resultaten van het klimaatakkoord van Parijs omdat ze erg onwaarschijnlijke aannames hanteert. Hier de resultaten van Lomborg versus die van anderen, zoals de Belgische topwetenschapper @JoeriRogelj
Read 9 tweets
Does model bias effect outcomes of the #IPCC 1.5°C emission scenarios #SR15?

The scenario database is over represented by some model frameworks. Taking statistics will over represent some models (eg, REMIND, AIM), discount others (eg @IEA), & not all models included!

The bias varies by scenario category, here for 1.5°C scenarios with "no or low overshoot" as highlighted in #SR15. Should REMIND & POLES get more weight then GCAM or MERGE?
I often take medians of scenarios to simplify communication, trying to reveal the "key characteristics" of 1.5°C (trying to find robust messages). The scenario community does not like this approach
Read 8 tweets
In 2013 @IPCC_CH concluded “Surface meltwater, although abundant on the #Greenland ice sheet, does not drive significant changes in basal lubrication that impact on ice sheet flow”. Could the opposite be emerging as a new paradigm? Thread 👇 1/12. Read and tweet. #climateclimate
The #IPCC #5AR statement (above) refers to efficient evacuation of meltwater in large channels, which can slow down the #ice flow by removing water that otherwise would lubricate and promote faster sliding over the bed. 2/12…
Evacuation of meltwater in efficient channels explains why #ice flow in some regions of #Greenland has slowed down despite year-on-year increases in air temperature and surface melting. But how widespread are those observations? 3/12…
Read 13 tweets

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