Reto Knutti
@retoknutti.bsky.social
Professor for climate physics at @ethzurich.bsky.social.
Essentially all inhabited places on the planet were warmer in 2024 than the recent baseline. Most of the ocean area too.
About 1/3 of the planet experienced record high temperatures.
We know why.
And we know how to fix it.
@copernicusecmwf.bsky.social
climate.copernicus.eu/global-clima...
About 1/3 of the planet experienced record high temperatures.
We know why.
And we know how to fix it.
@copernicusecmwf.bsky.social
climate.copernicus.eu/global-clima...
January 10, 2025 at 5:31 PM
Essentially all inhabited places on the planet were warmer in 2024 than the recent baseline. Most of the ocean area too.
About 1/3 of the planet experienced record high temperatures.
We know why.
And we know how to fix it.
@copernicusecmwf.bsky.social
climate.copernicus.eu/global-clima...
About 1/3 of the planet experienced record high temperatures.
We know why.
And we know how to fix it.
@copernicusecmwf.bsky.social
climate.copernicus.eu/global-clima...
«Unsere Untätigkeit ist die grösste Herausforderung»
Interview im FRZ-Magazin: Nachhaltigkeit im Fokus, ab Seite 4
www.yumpu.com/de/document/...
Interview im FRZ-Magazin: Nachhaltigkeit im Fokus, ab Seite 4
www.yumpu.com/de/document/...
December 16, 2024 at 10:10 AM
«Unsere Untätigkeit ist die grösste Herausforderung»
Interview im FRZ-Magazin: Nachhaltigkeit im Fokus, ab Seite 4
www.yumpu.com/de/document/...
Interview im FRZ-Magazin: Nachhaltigkeit im Fokus, ab Seite 4
www.yumpu.com/de/document/...
1) Die gesamten externen Kosten des Verkehrs werden dominiert vom Strassenverkehr.
2) Innerhalb des Strassenverkehrs sind die grössten Brocken:
Gesundheit Luft Strassenverkehr: 4.5 Mia
Klima Strassenverkehr: 5.2 Mia. (2/8)
2) Innerhalb des Strassenverkehrs sind die grössten Brocken:
Gesundheit Luft Strassenverkehr: 4.5 Mia
Klima Strassenverkehr: 5.2 Mia. (2/8)
November 27, 2024 at 9:41 AM
1) Die gesamten externen Kosten des Verkehrs werden dominiert vom Strassenverkehr.
2) Innerhalb des Strassenverkehrs sind die grössten Brocken:
Gesundheit Luft Strassenverkehr: 4.5 Mia
Klima Strassenverkehr: 5.2 Mia. (2/8)
2) Innerhalb des Strassenverkehrs sind die grössten Brocken:
Gesundheit Luft Strassenverkehr: 4.5 Mia
Klima Strassenverkehr: 5.2 Mia. (2/8)
20 yrs Google Zurich. What a success story!
AI and sustainability as top priorities, @ethzurich.bsky.social/EPFL with Christine Antlanger W. highlighting talent and innovation in CH, @uhoelzle.bsky.social telling stories, and ETH president Joël Mesot drawing a beautiful tornado in the drawing game!
AI and sustainability as top priorities, @ethzurich.bsky.social/EPFL with Christine Antlanger W. highlighting talent and innovation in CH, @uhoelzle.bsky.social telling stories, and ETH president Joël Mesot drawing a beautiful tornado in the drawing game!
November 25, 2024 at 9:18 PM
20 yrs Google Zurich. What a success story!
AI and sustainability as top priorities, @ethzurich.bsky.social/EPFL with Christine Antlanger W. highlighting talent and innovation in CH, @uhoelzle.bsky.social telling stories, and ETH president Joël Mesot drawing a beautiful tornado in the drawing game!
AI and sustainability as top priorities, @ethzurich.bsky.social/EPFL with Christine Antlanger W. highlighting talent and innovation in CH, @uhoelzle.bsky.social telling stories, and ETH president Joël Mesot drawing a beautiful tornado in the drawing game!
This addresses a long-standing problem: climate models seemingly underestimate the observed early-century warming. The issue is not biases in models, it’s an incomplete understanding of measurements.
Figure: CMIP3 models against observations in IPCC AR4 WG1 SPM.4. (11/13)
Figure: CMIP3 models against observations in IPCC AR4 WG1 SPM.4. (11/13)
November 20, 2024 at 4:14 PM
This addresses a long-standing problem: climate models seemingly underestimate the observed early-century warming. The issue is not biases in models, it’s an incomplete understanding of measurements.
Figure: CMIP3 models against observations in IPCC AR4 WG1 SPM.4. (11/13)
Figure: CMIP3 models against observations in IPCC AR4 WG1 SPM.4. (11/13)
paleoclimate reconstructions.
Based on these different lines of evidence, we argue that existing estimates of ocean temperatures in the early twentieth century are too cold, despite very high agreement in other periods. (8/13)
Based on these different lines of evidence, we argue that existing estimates of ocean temperatures in the early twentieth century are too cold, despite very high agreement in other periods. (8/13)
November 20, 2024 at 4:14 PM
paleoclimate reconstructions.
Based on these different lines of evidence, we argue that existing estimates of ocean temperatures in the early twentieth century are too cold, despite very high agreement in other periods. (8/13)
Based on these different lines of evidence, we argue that existing estimates of ocean temperatures in the early twentieth century are too cold, despite very high agreement in other periods. (8/13)
The too pronounced ocean cold anomaly in the early 20th century thus leads to ocean cooling in the period 1871-1910, and very fast warming 1901-1940, both of which is inconsistent with the reconstructions based on global land temperatures, physical understanding, all climate models, and (7/13)
November 20, 2024 at 4:14 PM
The too pronounced ocean cold anomaly in the early 20th century thus leads to ocean cooling in the period 1871-1910, and very fast warming 1901-1940, both of which is inconsistent with the reconstructions based on global land temperatures, physical understanding, all climate models, and (7/13)
We show that quantifying GMST from ocean-only data indicate lower temperatures 1900-1930 than reconstructing from land-only data, despite all known and fixed issues with measurement practice. (4/13)
November 20, 2024 at 4:14 PM
We show that quantifying GMST from ocean-only data indicate lower temperatures 1900-1930 than reconstructing from land-only data, despite all known and fixed issues with measurement practice. (4/13)
And while observations are of very high quality after WWII, the early 20th century remains a puzzle due to sparse coverage and changing measurement sources and instruments. (3/13)
November 20, 2024 at 4:14 PM
And while observations are of very high quality after WWII, the early 20th century remains a puzzle due to sparse coverage and changing measurement sources and instruments. (3/13)
Redrawing the global warming stripes.
In a new paper led by Sebastian Sippel published in Nature today, we show that the early 20th century global ocean surface temperatures and thereby global mean surface temperature were warmer than previously thought.
Thread... (1/13)
In a new paper led by Sebastian Sippel published in Nature today, we show that the early 20th century global ocean surface temperatures and thereby global mean surface temperature were warmer than previously thought.
Thread... (1/13)
November 20, 2024 at 4:14 PM
Redrawing the global warming stripes.
In a new paper led by Sebastian Sippel published in Nature today, we show that the early 20th century global ocean surface temperatures and thereby global mean surface temperature were warmer than previously thought.
Thread... (1/13)
In a new paper led by Sebastian Sippel published in Nature today, we show that the early 20th century global ocean surface temperatures and thereby global mean surface temperature were warmer than previously thought.
Thread... (1/13)
Achieving climate targets is primarily limited by politics, institutions and humans, not technology, solutions or money.
It's values and priorities, about who we are. (1/7)
It's values and priorities, about who we are. (1/7)
November 20, 2024 at 9:19 AM
Achieving climate targets is primarily limited by politics, institutions and humans, not technology, solutions or money.
It's values and priorities, about who we are. (1/7)
It's values and priorities, about who we are. (1/7)
Die Schweiz fällt im neuen CCPI Ranking 2025 zum Klimaschutz um 12 Plätze zurück auf Rang 33.
Die EU liegt auf Rang 17.
Kritisiert werden u.a. die ungenügenden Massnahmen in der Umsetzung des CO2 Gesetzes für effektive Reduktionen der Emissionen im eigenen Land.
ccpi.org
Die EU liegt auf Rang 17.
Kritisiert werden u.a. die ungenügenden Massnahmen in der Umsetzung des CO2 Gesetzes für effektive Reduktionen der Emissionen im eigenen Land.
ccpi.org
November 20, 2024 at 7:22 AM
Die Schweiz fällt im neuen CCPI Ranking 2025 zum Klimaschutz um 12 Plätze zurück auf Rang 33.
Die EU liegt auf Rang 17.
Kritisiert werden u.a. die ungenügenden Massnahmen in der Umsetzung des CO2 Gesetzes für effektive Reduktionen der Emissionen im eigenen Land.
ccpi.org
Die EU liegt auf Rang 17.
Kritisiert werden u.a. die ungenügenden Massnahmen in der Umsetzung des CO2 Gesetzes für effektive Reduktionen der Emissionen im eigenen Land.
ccpi.org
The next US president says global warming is a hoax. If you think this is crazy, given 2024 will again be the warmest year, welcome to reality. Rough times for climate and science, not just in the US.
In the old days, things were simply not known…. (Thread 1/12)
In the old days, things were simply not known…. (Thread 1/12)
November 16, 2024 at 7:59 PM
The next US president says global warming is a hoax. If you think this is crazy, given 2024 will again be the warmest year, welcome to reality. Rough times for climate and science, not just in the US.
In the old days, things were simply not known…. (Thread 1/12)
In the old days, things were simply not known…. (Thread 1/12)
Wow! Climate Twitter is coming here 😀
November 14, 2024 at 9:23 PM
Wow! Climate Twitter is coming here 😀
21st June is #ShowYourStripes day!
Switzerland warmed by more than 2.5°C since ~1850, and we see and feel it.
Data by Meteoswiss, stripes by the famous @edhawkins.bsky.social 😉
Switzerland warmed by more than 2.5°C since ~1850, and we see and feel it.
Data by Meteoswiss, stripes by the famous @edhawkins.bsky.social 😉
June 21, 2024 at 5:42 AM
21st June is #ShowYourStripes day!
Switzerland warmed by more than 2.5°C since ~1850, and we see and feel it.
Data by Meteoswiss, stripes by the famous @edhawkins.bsky.social 😉
Switzerland warmed by more than 2.5°C since ~1850, and we see and feel it.
Data by Meteoswiss, stripes by the famous @edhawkins.bsky.social 😉
NEST Podcast - zu Lösungen beim Klimaschutz und der Rolle der Wissenschaft in Gesellschaft und Politik
mit Peter Richner, NEST, EMPA
www.empa.ch/web/nest/pod...
mit Peter Richner, NEST, EMPA
www.empa.ch/web/nest/pod...
January 23, 2024 at 4:40 PM
NEST Podcast - zu Lösungen beim Klimaschutz und der Rolle der Wissenschaft in Gesellschaft und Politik
mit Peter Richner, NEST, EMPA
www.empa.ch/web/nest/pod...
mit Peter Richner, NEST, EMPA
www.empa.ch/web/nest/pod...
January 17, 2024 at 9:49 AM
2023 was not only the warmest year on record, but almost every day since July has seen a new global air temperature high for the time of year.
We do not fully understand what happened last year.
www.bbc.com/news/science...
We do not fully understand what happened last year.
www.bbc.com/news/science...
January 9, 2024 at 2:19 PM
2023 was not only the warmest year on record, but almost every day since July has seen a new global air temperature high for the time of year.
We do not fully understand what happened last year.
www.bbc.com/news/science...
We do not fully understand what happened last year.
www.bbc.com/news/science...
Neue Sotomo Helion Umfrage:
1️⃣ Klimaschutz und Energiewende gehen zu langsam vorwärts, die CH will mehr Tempo
2️⃣ Das grösste Potenzial sieht die Bevölkerung im technischen Fortschritt
3️⃣ Solar und Wärmepumpen sind breit akzeptiert. Hürden sind Kosten und rechtliche Aspekte
1️⃣ Klimaschutz und Energiewende gehen zu langsam vorwärts, die CH will mehr Tempo
2️⃣ Das grösste Potenzial sieht die Bevölkerung im technischen Fortschritt
3️⃣ Solar und Wärmepumpen sind breit akzeptiert. Hürden sind Kosten und rechtliche Aspekte
January 9, 2024 at 8:05 AM
Neue Sotomo Helion Umfrage:
1️⃣ Klimaschutz und Energiewende gehen zu langsam vorwärts, die CH will mehr Tempo
2️⃣ Das grösste Potenzial sieht die Bevölkerung im technischen Fortschritt
3️⃣ Solar und Wärmepumpen sind breit akzeptiert. Hürden sind Kosten und rechtliche Aspekte
1️⃣ Klimaschutz und Energiewende gehen zu langsam vorwärts, die CH will mehr Tempo
2️⃣ Das grösste Potenzial sieht die Bevölkerung im technischen Fortschritt
3️⃣ Solar und Wärmepumpen sind breit akzeptiert. Hürden sind Kosten und rechtliche Aspekte
We talk about population growth, and most know we will peak.
Few appreciate that after the peak, population will likely fall as steeply as it increases now.
PS: This alone won't solve env. problems, but create others.
Excellent @nytimes article:
www.nytimes.com/interactive/...
Few appreciate that after the peak, population will likely fall as steeply as it increases now.
PS: This alone won't solve env. problems, but create others.
Excellent @nytimes article:
www.nytimes.com/interactive/...
December 14, 2023 at 7:12 AM
We talk about population growth, and most know we will peak.
Few appreciate that after the peak, population will likely fall as steeply as it increases now.
PS: This alone won't solve env. problems, but create others.
Excellent @nytimes article:
www.nytimes.com/interactive/...
Few appreciate that after the peak, population will likely fall as steeply as it increases now.
PS: This alone won't solve env. problems, but create others.
Excellent @nytimes article:
www.nytimes.com/interactive/...
Aus einem Faktenblatt der Akademien Schweiz vor einigen Jahren:
December 9, 2023 at 10:22 AM
Aus einem Faktenblatt der Akademien Schweiz vor einigen Jahren:
Die Schweiz liegt als eines der reichsten und innovativsten Länder im Klimaschutz Ranking auf Rang 21. Hinter der EU.
Die ersten drei Plätze bleiben weiterhin leer.
ccpi.org
Die ersten drei Plätze bleiben weiterhin leer.
ccpi.org
December 8, 2023 at 5:10 PM
Die Schweiz liegt als eines der reichsten und innovativsten Länder im Klimaschutz Ranking auf Rang 21. Hinter der EU.
Die ersten drei Plätze bleiben weiterhin leer.
ccpi.org
Die ersten drei Plätze bleiben weiterhin leer.
ccpi.org
Climate change is fundamentally unfair:
The super-rich 1% were responsible the same amount of CO2 emissions (16%) as the poorest two thirds of humanity, according to the new Oxfam report.
policy-practice.oxfam.org/resources/cl...
The super-rich 1% were responsible the same amount of CO2 emissions (16%) as the poorest two thirds of humanity, according to the new Oxfam report.
policy-practice.oxfam.org/resources/cl...
November 20, 2023 at 3:25 PM
Climate change is fundamentally unfair:
The super-rich 1% were responsible the same amount of CO2 emissions (16%) as the poorest two thirds of humanity, according to the new Oxfam report.
policy-practice.oxfam.org/resources/cl...
The super-rich 1% were responsible the same amount of CO2 emissions (16%) as the poorest two thirds of humanity, according to the new Oxfam report.
policy-practice.oxfam.org/resources/cl...
Keine gute Voraussetzung für eine Demokratie:
Der Anteil von «News-Deprivierten» (mit Nachrichten "Unterversorgte") in der Schweiz ist 42% und hat sich seit 2009 verdoppelt. Bei jungen über 50%.
fög, Jahrbuch Qualität der Medien
www.foeg.uzh.ch/de/jahrbuch-...
Der Anteil von «News-Deprivierten» (mit Nachrichten "Unterversorgte") in der Schweiz ist 42% und hat sich seit 2009 verdoppelt. Bei jungen über 50%.
fög, Jahrbuch Qualität der Medien
www.foeg.uzh.ch/de/jahrbuch-...
November 4, 2023 at 3:24 PM
Keine gute Voraussetzung für eine Demokratie:
Der Anteil von «News-Deprivierten» (mit Nachrichten "Unterversorgte") in der Schweiz ist 42% und hat sich seit 2009 verdoppelt. Bei jungen über 50%.
fög, Jahrbuch Qualität der Medien
www.foeg.uzh.ch/de/jahrbuch-...
Der Anteil von «News-Deprivierten» (mit Nachrichten "Unterversorgte") in der Schweiz ist 42% und hat sich seit 2009 verdoppelt. Bei jungen über 50%.
fög, Jahrbuch Qualität der Medien
www.foeg.uzh.ch/de/jahrbuch-...
„Klimamodelle sind maximal unemotional“, sagt @positivemaren.bsky.social
Wie kommen wir vom Wissen zum Handeln? Wie machen wir die Klimakrise und Lösungen begreifbar? Was kann die Kunst beitragen?
Spannende Debatten an der @ethzurich.bsky.social Klimarunde 2023
Wie kommen wir vom Wissen zum Handeln? Wie machen wir die Klimakrise und Lösungen begreifbar? Was kann die Kunst beitragen?
Spannende Debatten an der @ethzurich.bsky.social Klimarunde 2023
October 31, 2023 at 6:07 PM
„Klimamodelle sind maximal unemotional“, sagt @positivemaren.bsky.social
Wie kommen wir vom Wissen zum Handeln? Wie machen wir die Klimakrise und Lösungen begreifbar? Was kann die Kunst beitragen?
Spannende Debatten an der @ethzurich.bsky.social Klimarunde 2023
Wie kommen wir vom Wissen zum Handeln? Wie machen wir die Klimakrise und Lösungen begreifbar? Was kann die Kunst beitragen?
Spannende Debatten an der @ethzurich.bsky.social Klimarunde 2023