Robert Rohde
@rarohde.bsky.social
Chief Scientist for @berkeleyearth.org.
Physics PhD & data nerd. Usually focused on climate change, fossil fuels, & air quality issues.
Physics PhD & data nerd. Usually focused on climate change, fossil fuels, & air quality issues.
Pinned
Robert Rohde
@rarohde.bsky.social
· Nov 22
Early-twentieth-century cold bias in ocean surface temperature observations - Nature
Independent statistical reconstructions of the global mean surface temperature from either ocean or land data show that existing estimates of early-twentieth-century ocean surface temperatures are too...
www.nature.com
A new paper led by Sebastian Sippel just appeared in Nature arguing that ocean temperature measurements in the early 20th century have a cold bias.
It's a fun story illustrating the process of scientific discovery, so let me talk about it a bit. 🧵
www.nature.com/articles/s41...
It's a fun story illustrating the process of scientific discovery, so let me talk about it a bit. 🧵
www.nature.com/articles/s41...
Don't worry guys, the countries at COP30 definitely say they want to reduce greenhouse gas emissions.
Where are those emissions coming from? No idea.
*screams into the void*
www.bbc.com/news/article...
Where are those emissions coming from? No idea.
*screams into the void*
www.bbc.com/news/article...
COP30: UN climate summit drops mention of fossil fuels from draft deal
A row over fossil fuels has broken out at COP30 but this is also likely to be a negotiating tactic.
www.bbc.com
November 21, 2025 at 1:56 PM
Don't worry guys, the countries at COP30 definitely say they want to reduce greenhouse gas emissions.
Where are those emissions coming from? No idea.
*screams into the void*
www.bbc.com/news/article...
Where are those emissions coming from? No idea.
*screams into the void*
www.bbc.com/news/article...
I'm not sure I'm entirely ready to already be talking about the next El Niño after all the temperature records that were set during the 2023/2024 El Niño.
The long-range forecasts from IRI/CPC expect that this La Niña will be weak and short-lived, dissipating early in 2026.
The development of a new El Niño event is possible in mid-to-late 2026.
iri.columbia.edu/our-expertis...
3/3
The development of a new El Niño event is possible in mid-to-late 2026.
iri.columbia.edu/our-expertis...
3/3
November 21, 2025 at 12:25 PM
I'm not sure I'm entirely ready to already be talking about the next El Niño after all the temperature records that were set during the 2023/2024 El Niño.
In @berkeleyearth.org's analysis, Antarctica set a new record for the monthly-average temperature in October.
This is part of a long-term warming trend.
1/
This is part of a long-term warming trend.
1/
November 21, 2025 at 12:00 PM
In @berkeleyearth.org's analysis, Antarctica set a new record for the monthly-average temperature in October.
This is part of a long-term warming trend.
1/
This is part of a long-term warming trend.
1/
With everything else going on in the world, it is easy to miss that NOAA has officially declared the return of La Niña.
This follows the weak La Niña at the start of 2025 and neutral conditions in recent months.
1/
This follows the weak La Niña at the start of 2025 and neutral conditions in recent months.
1/
November 21, 2025 at 11:15 AM
With everything else going on in the world, it is easy to miss that NOAA has officially declared the return of La Niña.
This follows the weak La Niña at the start of 2025 and neutral conditions in recent months.
1/
This follows the weak La Niña at the start of 2025 and neutral conditions in recent months.
1/
2025 is expected to conclude as the 3rd warmest year to have been directly measured.
This would place 2025 behind only the El Niño boosted record warmth in 2023 and 2024, and still modestly above the long-term trend.
berkeleyearth.org/october-2025...
🧪🌊
This would place 2025 behind only the El Niño boosted record warmth in 2023 and 2024, and still modestly above the long-term trend.
berkeleyearth.org/october-2025...
🧪🌊
November 21, 2025 at 11:11 AM
2025 is expected to conclude as the 3rd warmest year to have been directly measured.
This would place 2025 behind only the El Niño boosted record warmth in 2023 and 2024, and still modestly above the long-term trend.
berkeleyearth.org/october-2025...
🧪🌊
This would place 2025 behind only the El Niño boosted record warmth in 2023 and 2024, and still modestly above the long-term trend.
berkeleyearth.org/october-2025...
🧪🌊
Reposted by Robert Rohde
Temperature Update for October 2025
Third warmest October in the instrumental record.
Similar conditions to September.
A weak La Niña returns in the Pacific.
2025 is very likely to be the 3rd warmest year.
🧵🧪🌊
Third warmest October in the instrumental record.
Similar conditions to September.
A weak La Niña returns in the Pacific.
2025 is very likely to be the 3rd warmest year.
🧵🧪🌊
November 21, 2025 at 11:06 AM
Temperature Update for October 2025
Third warmest October in the instrumental record.
Similar conditions to September.
A weak La Niña returns in the Pacific.
2025 is very likely to be the 3rd warmest year.
🧵🧪🌊
Third warmest October in the instrumental record.
Similar conditions to September.
A weak La Niña returns in the Pacific.
2025 is very likely to be the 3rd warmest year.
🧵🧪🌊
Tomorrow, the Berkeley Earth team will share updates from the October 2025 Temperature Report and discuss the latest global climate signals.
Wednesday 11/19 at 8am PDT / 11am EDT / 5pm CET
Register:
us02web.zoom.us/webinar/regi...
Wednesday 11/19 at 8am PDT / 11am EDT / 5pm CET
Register:
us02web.zoom.us/webinar/regi...
Welcome! You are invited to join a webinar: Berkeley Earth Monthly Press Briefing. After registering, you will receive a confirmation email about joining the webinar.
Berkeley Earth invites you to our next Monthly Press Briefing, where our scientists will present the latest global temperature findings and climate insights for October 2025.
This 30-minute session w...
us02web.zoom.us
November 18, 2025 at 3:31 PM
Tomorrow, the Berkeley Earth team will share updates from the October 2025 Temperature Report and discuss the latest global climate signals.
Wednesday 11/19 at 8am PDT / 11am EDT / 5pm CET
Register:
us02web.zoom.us/webinar/regi...
Wednesday 11/19 at 8am PDT / 11am EDT / 5pm CET
Register:
us02web.zoom.us/webinar/regi...
When I reflect back on my time talking about man-made climate change, I think there are fewer people today who doubt its existence, but probably far more people whose first response is that climate change isn't very serious.
November 11, 2025 at 2:46 PM
When I reflect back on my time talking about man-made climate change, I think there are fewer people today who doubt its existence, but probably far more people whose first response is that climate change isn't very serious.
Is there anything to look forward to regarding COP30?
I feel like the expectations for this year's annual climate conference have been pretty low, not least of which because of the US pulling out.
I feel like the expectations for this year's annual climate conference have been pretty low, not least of which because of the US pulling out.
November 10, 2025 at 2:50 PM
Is there anything to look forward to regarding COP30?
I feel like the expectations for this year's annual climate conference have been pretty low, not least of which because of the US pulling out.
I feel like the expectations for this year's annual climate conference have been pretty low, not least of which because of the US pulling out.
The exponential rise of Chinese solar power feeds on itself.
Continued growth of solar production in China requires ever greater amounts of energy, but the energy being captured by the solar panels installed in China has grown even faster.
A virtuous cycle with energy to spare.
Continued growth of solar production in China requires ever greater amounts of energy, but the energy being captured by the solar panels installed in China has grown even faster.
A virtuous cycle with energy to spare.
November 6, 2025 at 1:54 PM
The exponential rise of Chinese solar power feeds on itself.
Continued growth of solar production in China requires ever greater amounts of energy, but the energy being captured by the solar panels installed in China has grown even faster.
A virtuous cycle with energy to spare.
Continued growth of solar production in China requires ever greater amounts of energy, but the energy being captured by the solar panels installed in China has grown even faster.
A virtuous cycle with energy to spare.
Over the last 10 years, the world spent ~$70 trillion on fossil fuels and associated infrastructure. They provide 76% of global energy.
Over the same time, ~$3.5 trillion was spent on wind & solar, which now provide 6% of global energy.
Pretty good value for the investment.
Over the same time, ~$3.5 trillion was spent on wind & solar, which now provide 6% of global energy.
Pretty good value for the investment.
November 5, 2025 at 11:54 AM
Over the last 10 years, the world spent ~$70 trillion on fossil fuels and associated infrastructure. They provide 76% of global energy.
Over the same time, ~$3.5 trillion was spent on wind & solar, which now provide 6% of global energy.
Pretty good value for the investment.
Over the same time, ~$3.5 trillion was spent on wind & solar, which now provide 6% of global energy.
Pretty good value for the investment.
Reposted by Robert Rohde
The new UNEP report is out with the latest estimates of 2100 warming outcomes under current policies, NDCs, and net-zero targets. Here is how it compares to both the IPCC scenarios and other estimates (CAT and IEA, who will release their own updates soon!).
November 4, 2025 at 6:05 PM
The new UNEP report is out with the latest estimates of 2100 warming outcomes under current policies, NDCs, and net-zero targets. Here is how it compares to both the IPCC scenarios and other estimates (CAT and IEA, who will release their own updates soon!).
The explosive, exponential growth of solar energy makes it the fastest growing energy technology in history.
Cheap to build and fast to deploy, solar installations grew 10-fold in the last 10 years and provided 6.7% of the world's electricity in 2024.
The future is very sunny.
Cheap to build and fast to deploy, solar installations grew 10-fold in the last 10 years and provided 6.7% of the world's electricity in 2024.
The future is very sunny.
November 4, 2025 at 11:27 PM
The explosive, exponential growth of solar energy makes it the fastest growing energy technology in history.
Cheap to build and fast to deploy, solar installations grew 10-fold in the last 10 years and provided 6.7% of the world's electricity in 2024.
The future is very sunny.
Cheap to build and fast to deploy, solar installations grew 10-fold in the last 10 years and provided 6.7% of the world's electricity in 2024.
The future is very sunny.
I thoroughly believe in celebrating the small victories, so here is a tiny one.
The percentage of humanity's energy system that is derived from fossil fuels, ticked down again in 2024 and is now technically at the lowest level since the 1960s, though fossil fuels still dominate.
The percentage of humanity's energy system that is derived from fossil fuels, ticked down again in 2024 and is now technically at the lowest level since the 1960s, though fossil fuels still dominate.
November 4, 2025 at 2:29 PM
I thoroughly believe in celebrating the small victories, so here is a tiny one.
The percentage of humanity's energy system that is derived from fossil fuels, ticked down again in 2024 and is now technically at the lowest level since the 1960s, though fossil fuels still dominate.
The percentage of humanity's energy system that is derived from fossil fuels, ticked down again in 2024 and is now technically at the lowest level since the 1960s, though fossil fuels still dominate.
I hope Scott Adams gets any medical treatment he needs.
I hope everyone does.
But it is hard to imagine a clearer example of how f-ed up and broken the USA medical system is than watching a wealthy and connected person get help that normal people could never hope for.
I hope everyone does.
But it is hard to imagine a clearer example of how f-ed up and broken the USA medical system is than watching a wealthy and connected person get help that normal people could never hope for.
November 3, 2025 at 11:16 AM
I hope Scott Adams gets any medical treatment he needs.
I hope everyone does.
But it is hard to imagine a clearer example of how f-ed up and broken the USA medical system is than watching a wealthy and connected person get help that normal people could never hope for.
I hope everyone does.
But it is hard to imagine a clearer example of how f-ed up and broken the USA medical system is than watching a wealthy and connected person get help that normal people could never hope for.
The USA only has 10-15 years of proven oil & gas deposits remaining.
The USA has had 10-15 years remaining for the last 40+ years.
New fossil fuel discoveries and new technology (e.g. fracking) have expanded fossil fuel reserves even faster than production has grown.
The USA has had 10-15 years remaining for the last 40+ years.
New fossil fuel discoveries and new technology (e.g. fracking) have expanded fossil fuel reserves even faster than production has grown.
October 27, 2025 at 1:47 PM
The USA only has 10-15 years of proven oil & gas deposits remaining.
The USA has had 10-15 years remaining for the last 40+ years.
New fossil fuel discoveries and new technology (e.g. fracking) have expanded fossil fuel reserves even faster than production has grown.
The USA has had 10-15 years remaining for the last 40+ years.
New fossil fuel discoveries and new technology (e.g. fracking) have expanded fossil fuel reserves even faster than production has grown.
Reposted by Robert Rohde
September 2025 was the third warmest on record in the Berkeley Earth dataset. But this downplays how anomalous it was; without 2023 and 2024 this year would have been well above any prior records and well above the long-term trend:
October 23, 2025 at 9:43 PM
September 2025 was the third warmest on record in the Berkeley Earth dataset. But this downplays how anomalous it was; without 2023 and 2024 this year would have been well above any prior records and well above the long-term trend:
Our live briefing on September climate will start a few hours from now.
Tomorrow Berkeley Earth will hold our monthly press briefing to cover the September Temperature Report.
8 am PDT / 11 am EDT / 5 pm CET
Everyone is welcome to attend to hear the updates and ask your burning climate questions.
Registration:
us02web.zoom.us/webinar/regi...
8 am PDT / 11 am EDT / 5 pm CET
Everyone is welcome to attend to hear the updates and ask your burning climate questions.
Registration:
us02web.zoom.us/webinar/regi...
Welcome! You are invited to join a webinar: Berkeley Earth Monthly Press Briefing. After registering, you will receive a confirmation email about joining the webinar.
Berkeley Earth invites you to our next Monthly Press Briefing, where our scientists will present the latest global temperature findings and climate insights for September 2025.
This 30-minute session...
us02web.zoom.us
October 23, 2025 at 12:29 PM
Our live briefing on September climate will start a few hours from now.
Reposted by Robert Rohde
Big news out of @climatecentral.org today! We've brought back NOAA's billion dollar disaster dataset!
Check out our interactive website and bookmark it because there's more to come!
www.climatecentral.org/climate-serv...
Check out our interactive website and bookmark it because there's more to come!
www.climatecentral.org/climate-serv...
October 22, 2025 at 2:43 PM
Big news out of @climatecentral.org today! We've brought back NOAA's billion dollar disaster dataset!
Check out our interactive website and bookmark it because there's more to come!
www.climatecentral.org/climate-serv...
Check out our interactive website and bookmark it because there's more to come!
www.climatecentral.org/climate-serv...
Reposted by Robert Rohde
You can help catalogue historical weather data from across Africa as a vital step towards making it available for climate research here 👇
www.zooniverse.org/projects/hea...
www.zooniverse.org/projects/hea...
Weather Archive Africa | Zooniverse - People-powered research
Help catalogue vital meteorological data from across Africa as a vital step towards making it available for climate research.
www.zooniverse.org
October 22, 2025 at 2:07 PM
You can help catalogue historical weather data from across Africa as a vital step towards making it available for climate research here 👇
www.zooniverse.org/projects/hea...
www.zooniverse.org/projects/hea...
As an aside, Berkeley Earth's September Temperature Report is being released about a week later than we normally target due to ongoing issues with NOAA data.
Can someone please reopen the government?
Can someone please reopen the government?
Tomorrow Berkeley Earth will hold our monthly press briefing to cover the September Temperature Report.
8 am PDT / 11 am EDT / 5 pm CET
Everyone is welcome to attend to hear the updates and ask your burning climate questions.
Registration:
us02web.zoom.us/webinar/regi...
8 am PDT / 11 am EDT / 5 pm CET
Everyone is welcome to attend to hear the updates and ask your burning climate questions.
Registration:
us02web.zoom.us/webinar/regi...
Welcome! You are invited to join a webinar: Berkeley Earth Monthly Press Briefing. After registering, you will receive a confirmation email about joining the webinar.
Berkeley Earth invites you to our next Monthly Press Briefing, where our scientists will present the latest global temperature findings and climate insights for September 2025.
This 30-minute session...
us02web.zoom.us
October 22, 2025 at 2:40 PM
As an aside, Berkeley Earth's September Temperature Report is being released about a week later than we normally target due to ongoing issues with NOAA data.
Can someone please reopen the government?
Can someone please reopen the government?
Tomorrow Berkeley Earth will hold our monthly press briefing to cover the September Temperature Report.
8 am PDT / 11 am EDT / 5 pm CET
Everyone is welcome to attend to hear the updates and ask your burning climate questions.
Registration:
us02web.zoom.us/webinar/regi...
8 am PDT / 11 am EDT / 5 pm CET
Everyone is welcome to attend to hear the updates and ask your burning climate questions.
Registration:
us02web.zoom.us/webinar/regi...
Welcome! You are invited to join a webinar: Berkeley Earth Monthly Press Briefing. After registering, you will receive a confirmation email about joining the webinar.
Berkeley Earth invites you to our next Monthly Press Briefing, where our scientists will present the latest global temperature findings and climate insights for September 2025.
This 30-minute session...
us02web.zoom.us
October 22, 2025 at 2:34 PM
Tomorrow Berkeley Earth will hold our monthly press briefing to cover the September Temperature Report.
8 am PDT / 11 am EDT / 5 pm CET
Everyone is welcome to attend to hear the updates and ask your burning climate questions.
Registration:
us02web.zoom.us/webinar/regi...
8 am PDT / 11 am EDT / 5 pm CET
Everyone is welcome to attend to hear the updates and ask your burning climate questions.
Registration:
us02web.zoom.us/webinar/regi...
Admittedly a bit slow on the uptake, but i am enjoying diving into HCLIM: nature.com/articles/s41...
A dataset of weather stations with pre-1890 data.
This includes ~450 temperature stations whose data was not previously available in the normal digital archives.
h/t @labradorice.bsky.social
A dataset of weather stations with pre-1890 data.
This includes ~450 temperature stations whose data was not previously available in the normal digital archives.
h/t @labradorice.bsky.social
The global historical climate database HCLIM - Scientific Data
Measurement(s) temperature of air Technology Type(s) weather stations Sample Characteristic - Environment Air - temperature, precipitation and pressre Sample Characteristic - Location ...
nature.com
October 22, 2025 at 10:43 AM
Admittedly a bit slow on the uptake, but i am enjoying diving into HCLIM: nature.com/articles/s41...
A dataset of weather stations with pre-1890 data.
This includes ~450 temperature stations whose data was not previously available in the normal digital archives.
h/t @labradorice.bsky.social
A dataset of weather stations with pre-1890 data.
This includes ~450 temperature stations whose data was not previously available in the normal digital archives.
h/t @labradorice.bsky.social
Definitely not your normal story about Wikipedians.
Great job @fuzheado.bsky.social and Richard Knipel.
www.nytimes.com/2025/10/17/n...
Great job @fuzheado.bsky.social and Richard Knipel.
www.nytimes.com/2025/10/17/n...
Wikipedia Volunteers Avert Tragedy by Taking Down Gunman at Conference
www.nytimes.com
October 18, 2025 at 11:34 AM
Definitely not your normal story about Wikipedians.
Great job @fuzheado.bsky.social and Richard Knipel.
www.nytimes.com/2025/10/17/n...
Great job @fuzheado.bsky.social and Richard Knipel.
www.nytimes.com/2025/10/17/n...
10+ years ago, I decided to use a single byte to track source ID in the Berkeley Earth dataset.
I've now allocated 244 of the 255 possible values, and I'm getting worried...
I've now allocated 244 of the 255 possible values, and I'm getting worried...
October 17, 2025 at 1:48 PM
10+ years ago, I decided to use a single byte to track source ID in the Berkeley Earth dataset.
I've now allocated 244 of the 255 possible values, and I'm getting worried...
I've now allocated 244 of the 255 possible values, and I'm getting worried...