Great meeting you as well!

My understanding is that natural sinks absorb 50~55% of human GHG emissions. I never heard that it was a low as 38%. (Maybe GWP assumptions?)

Also, that's not the "big picture". The big picture is the Earth Energy Imbalance (EEI). GHG is one part of that. Aerosols & albedo play a big role too.

Starting soon!

Abrupt Gulf Stream path changes are a precursor to a collapse of the Atlantic Meridional Overturning Circulation The Gulf Stream is part of the Atlantic Meridional Overturning Circulation (AMOC). The AMOC is a tipping element and may collapse under changing forcing. However, the role of the Gulf Stream in such a...

René's recent paper on AMOC collapse:

Abrupt Gulf Stream path changes are a precursor to a collapse of the Atlantic Meridional Overturning Circulation:
pmc.ncbi.nlm.nih.gov/articles/PMC...

Current Events: Are We Hitting the AMOC Tipping Point? with AMOC Scientist René van Westen YouTube video by Climate Chat

Sunday 4/19 at 10am PT on Climate Chat: Current Events: Are We Hitting the #AMOC Tipping Point? with AMOC Scientist René van Westen. On YouTube (live & recorded) & all podcast platforms (recorded).
@leonsimons.com @bikingmzstacey.bsky.social @radsci.bsky.social
youtube.com/live/JMtu9W4...

Why is 1-1.9 forbidden while the others are not?

And note we are tracking 8.5 climate *forcing* even if we are not tracking 8.5 emissions. The forcing is what matters.

Doing SRM requires that we phase out emissions. Even without SRM, it is required that we phase out emissions. There is a difference between what we are required to do and what we will do. That's why we are facing a climate crisis!

With your logic, you can say don't do emissions reduction (ER) until we get SRM going. ER won't work (keep us under +2ºC) without SRM so why bother doing it on its own?

While I'm being facetious, the point is we need all 3 & CDR will take time to scale & SRM needs more research before deployment.

SRM/Solar-Geoengineering - YouTube Programs about cooling the Earth by using Sunlight Reflection Methods/Solar Radiation Management (SRM), also know as Solar-Geoengineering.

Termination shock (TS) assumes we do nothing to lower & remove emissions. If we choose to fail, we will. If we choose to succeed, that includes SRM. We are guaranteed TS-level temps if we don't do SRM. SRM also lowers emissions.

We have discussed TS in the past:
www.youtube.com/playlist?lis...

It might take a while for "Climate Chat" to appear in search results.

All Climate Chat episodes are now available as audio podcasts on Apple Podcasts, Spotify (below), etc.!
@leonsimons.com @bikingmzstacey.bsky.social @radsci.bsky.social
#Climate #Podcast
open.spotify.com/show/1m0OSLW...

Climate Chat Earth Sciences Podcast · Climate Chat is a channel where we discuss all things climate with scientists, technologists, authors, advocates, communicators and others helping us understand and fight clim...

All Climate Chat episodes are now available as audio podcasts on Apple Podcasts (below), Spotify (in thread), etc.!
@leonsimons.com @bikingmzstacey.bsky.social @radsci.bsky.social
#Climate #Podcast
podcasts.apple.com/us/podcast/c...

There are 3 main climate solutions: Emissions Reduction, CDR & SRM. Why are you blaming 2 solutions (that we aren't doing yet) for our failure to do the 1st one? How about blaming politicians, FF execs, the media, the public, etc.?
All 3 are needed for survival, so let's push all of them!

David, you are invited on Climate Chat!

But the implication in your article is we should focus on 1 climate solution (emissions reduction-ER) when 2 more are *also* needed: CDR & SRM. There is no fixed budget for saving civilization. Funding for CDR & SRM should not reduce ER efforts.

Can We Reflect the Sun & Cool the Earth? with SRM Scientist Doug MacMartin YouTube video by Climate Chat

I had a great discussion today with Cornell's Doug MacMartin on Sunlight Reflection Methods (SRM). From how & when to do it, impacts, to the types of planes we can use. Long, but you will learn a lot about the technology we need to avoid catastrophe.
youtube.com/live/Vm0vnMI...

Starting soon!

I'm not OK at all with kicking the can down the road. See my climate action plan below.

The sad truth is, at this point, that reduction-only will not keep us below 3ºC, let alone 2ºC, nor will it enable us to avoid tipping points such as AMOC collapse. We need reduction, CDR & SRM to stay safe.

So, you're Ok with going over +2ºC of warming (and likely 3ºC) & crossing tipping points? At this point, emissions reduction & CDR alone cannot keep us safe.

You need to compare the risk of *doing* SRM with the risk of *Not doing* SRM.

SRM/Solar-Geoengineering - YouTube Programs about cooling the Earth by using Sunlight Reflection Methods/Solar Radiation Management (SRM), also know as Solar-Geoengineering.

Climate Chat SRM/Solar-Geoengineering Playlist:
www.youtube.com/playlist?lis...

Solar Geoengineering/Sunlight Reflection Methods: Safe, Effective, Needed? w/ Doug MacMartin YouTube video by Climate Chat

Previous 2024 Climate Chat interview with @DougMacMartin :
"Solar Geoengineering/Sunlight Reflection Methods: Safe, Effective, Needed? w/ Doug MacMartin":
youtube.com/live/_JBLMsX...

Sunlight Reflection Methods Can Stop AMOC Collapse with Douglas MacMartin YouTube video by Climate Chat

Previous 2025 Climate Chat interview with @DougMacMartin :
"Sunlight Reflection Methods Can Stop AMOC Collapse with Douglas MacMartin"
youtube.com/live/lPnTQIX...

Can We Reflect the Sun & Cool the Earth? with SRM Scientist Doug MacMartin YouTube video by Climate Chat

Sunday 4/12 at 10am PT on Climate Chat: Can We Reflect the Sun & Cool the Earth? with #SRM Scientist Doug MacMartin.
#Geoengineering #ClimateChange
@leonsimons.com @bikingmzstacey.bsky.social @radsci.bsky.social
youtube.com/live/Vm0vnMI...

Yes, we need these things. But it is unlikely that voluntary personal choices will have much impact of global GHG emissions, though it could help a little bit. What we need are *polices* that transform our food systems, stop deforestation & phase out fossil fuels.

Dan Miller_20 Point Blueprint to Actually Fight Climate Change_HPAC_April 2, 2026 YouTube video by Healthy Planet Action Coalition

I gave a talk last week to the Healthy Planet Action Coalition (HPAC) on my 20-point climate action plan. Here is a recording of that talk.
#ClimateAction
youtu.be/OlKEiSzdJLQ?...

Starting soon!

The Iran War Climate Paradox Explained YouTube video by Climate Chat

Sunday 4/5 at 10am PT on Climate Chat: The Iran War Climate Paradox Explained with host Dan Miller. Why lower oil demand will not lower atmospheric CO2.
@LeonSimons8 @drivingmzstacey @radsci
youtube.com/live/YqumXgb...

It’s getting closer…

Yes. While we may not be following the RCP8.5 *emissions* pathway, we are following the RCP8.5 *climate forcing* pathway! As James Hansen has been pointing out, ECS (climate sensitivity) is likely 50% higher than the IPCC assumes so we are on track for RCP8.5 warming (or more!).

Thanks. This is a far more useful graph to see what is going on with emissions (and energy growth).

That’s great, but you can’t tell that from the graph.