Leah Goldfarb

2025 was an exceptional year for the Earth's climate
⬆️ Warmest ocean heat content
⬆️ Tied as second warmest surface temps
⬆️ Second warmest troposphere
⬆️ Record high sea level and GHGs
⬇️ Record low winter Arctic ice

New State of the Climate over at Carbon Brief: www.carbonbrief.org/...

Please read

www.forbes.com/sites/marsha...

🌡️ November 2025 was the third-warmest November on record globally, keeping 2025 on track to be the second- or third-warmest year recorded. The global three-year average temperature for 2023–2025 will likely exceed 1.5°C above pre-industrial levels for the first time. 

Read more ⬇️

China’s clean-energy revolution will reshape markets and politics The world’s biggest manufacturer now has an interest in the world decarbonising

The US is the world's largest oil and gas producer. Yet, "China is now making more money from exporting green technology than America makes from exporting fossil fuels."

Record leap in CO2 fuels fears of accelerating global heating CO2 in air hit new high last year, with scientists concerned natural land and ocean carbon sinks are weakening

Record leap in CO2 fuels fears of accelerating global heating

- CO2 in the air hit new high last year, with scientists concerned natural land and ocean carbon sinks are weakening
@wmo-global.bsky.social

#climatecrisis
Story by me
www.theguardian.com/environment/...

Carbon dioxide (CO₂) averaged about 430 ppm in June 2025

10 years ago June averaged about 403 ppm

Preliminary data from @noaa.gov: gml.noaa.gov/ccgg/trends/

Indicators of Global Climate Change 2024: annual update of key indicators of the state of the climate system and human influence Abstract. In a rapidly changing climate, evidence-based decision-making benefits from up-to-date and timely information. Here we compile monitoring datasets (published at https://doi.org/10.5281/zenodo.15639576; Smith et al., 2025a) to produce updated estimates for key indicators of the state of the climate system: net emissions of greenhouse gases and short-lived climate forcers, greenhouse gas concentrations, radiative forcing, the Earth's energy imbalance, surface temperature changes, warming attributed to human activities, the remaining carbon budget, and estimates of global temperature extremes. This year, we additionally include indicators for sea-level rise and land precipitation change. We follow methods as closely as possible to those used in the IPCC Sixth Assessment Report (AR6) Working Group One report. The indicators show that human activities are increasing the Earth's energy imbalance and driving faster sea-level rise compared to the AR6 assessment. For the 2015–2024 decade average, observed warming relative to 1850–1900 was 1.24 [1.11 to 1.35] °C, of which 1.22 [1.0 to 1.5] °C was human-induced. The 2024-observed best estimate of global surface temperature (1.52 °C) is well above the best estimate of human-caused warming (1.36 °C). However, the 2024 observed warming can still be regarded as a typical year, considering the human-induced warming level and the state of internal variability associated with the phase of El Niño and Atlantic variability. Human-induced warming has been increasing at a rate that is unprecedented in the instrumental record, reaching 0.27 [0.2–0.4] °C per decade over 2015–2024. This high rate of warming is caused by a combination of greenhouse gas emissions being at an all-time high of 53.6±5.2 Gt CO2e yr−1 over the last decade (2014–2023), as well as reductions in the strength of aerosol cooling. Despite this, there is evidence that the rate of increase in CO2 emissions over the last decade has slowed compared to the 2000s, and depending on societal choices, a continued series of these annual updates over the critical 2020s decade could track decreases or increases in the rate of the climatic changes presented here.

Our new paper updating key metrics in the IPCC is now out, and the news is grim:

⬆️ Human induced warming now at 1.36C
⬆️ Rate of warming now 0.27C / decade
⬆️ Sharp increase in Earth's energy imbalance
⬇️ Remaining 1.5C carbon budget only 130 GtCO2

essd.copernicus.org/...

Here’s how Trump’s war on science is going. NSF funding is at the lowest level in decades. We’ll lose knowledge, generations of scientists, and US competitiveness.

www.nytimes.com/interactive/...

It was so great seeing you! Congrats on your certification!

🚨 Yup.

Art of the Deal 💀🤯

💯

🎉 Thrilled to be selected as a mentor for the upcoming @theclimatereality.bsky.social training in Paris this March.

News: Half of CDC "disease detectives" terminated. DOGE takes aim at US disease surveillance. Entire first-year class of the Epidemic Intelligence Service must be out by 5 p.m., sources say. Also: a major CDC contractor "just let go," and others may follow.

Major news:

Entire first-year class of the Epidemic Intelligence Service must be out by 5pm, sources say.

Also: a major CDC contractor "just let go." Others may follow.

This is an attack on our ability to detect outbreaks.

More, with quotes from CDC officials:
open.substack.com/pub/insideme...

Extrême droite, médias, youtubeurs : qui sont les faussaires du climat ? Tandis que Trump s’en prend aux régulations scientifiques, un « climatoscepticisme 2.0 » se développe en Europe. Il ne remet pas forcément en cause le dérèglement climatique mais instille le...

[#ÀlairLibre 📺] Extrême droite, médias, youtubeurs: qui sont les faussaires du climat?

Par À l’air libre

Spot on.

Human and nature dynamics (HANDY): Modeling inequality and use of resources in the collapse or sustainability of societies There are widespread concerns that current trends in resource-use are unsustainable, but possibilities of overshoot/collapse remain controversial. Col…

This ten year old paper by my friend & colleague Eugenia Kalnay and colleagues modeling the combined effects of environmental degradation and wealth disparity on societal stability didn't get much attention at the time. It feels especially relevant now: www.sciencedirect.com/science/arti...

Temperatures at north pole 20C above average and beyond ice melting point Scientists say unusually mild temperatures linked to low-pressure system over Iceland directing strong flow of warm air towards north pole

Temperatures at north pole 20C above average and beyond ice melting point
www.theguardian.com/environment/...

The policy lead for CDC's H5N1 response has abruptly resigned.

Sources tell me CDC's response to the bird flu pandemic has been severely hobbled by the chaos of the past two weeks.

Trump again withdraws the United States from the Paris Climate Agreement, joining an exclusive club with Iran, Libya, and Yemen.

Withdrawal formally takes effect one year after receipt by the UN.

I like your energy too!

FYI, I tried to use the hashtags above on Instagram, but for some reason, that post was not made public. 🤔 So much for free speech. I am just done with these three platforms -- it is not even worth my time to try again.

Happy 45^2!

#GreatMetaWalkoff, #GreatTwitterWalkoff, #GreatXWalkoff

(PDF) Misinformation and Disinformation in the Era of Social Media: The Need for Fact-Checking Skills PDF | The paper explores the need for fact-checking skills in the era of misinformation and disinformation on social media. This paper employs a... | Find, read and cite all the research you need on R...

On 20 Jan, I will be leaving X, Facebook, and Instagram. I can no longer “be the product” for these “free” platforms that allow scientific facts to be disputed – spreading misinformation like a virus. I'll miss my friends there ♥️, but it's time for a change.

More info here:
shorturl.at/8u4nq

☀️🌪️The EU generated a RECORD 30% of electricity from wind and solar in the first half of 2024, for the first time surpassing fossil fuels’ share of 27%

🔗Read more electricity highlights from 2024: ember-energy.org/lat...

Supreme Court declines to hear challenge to California’s strict vehicle emissions rules | CNN Politics The Supreme Court declined Monday to take up an appeal from conservative states challenging California’s ability to establish strict vehicle emission rules that effectively set the standard for the re...

US Supreme Court declines to hear challenge to California's right to set own vehicle emis standards for CO2
www.cnn.com/2024/12/16/p...

CA's waiver to control CO2 granted by EPA based on my 2009 EPA testimony that CO2 affects local health in already-polluted cities
web.stanford.edu/group/efmh/j...

Indeed, I too struggled with this for years and then I found….SPYX.

Sadly not a @theonion.com headline. #vaccineswork

Wow. Wonder what this means for Europe — probably the same.

Arctic Tundra Has Long Helped Cool Earth. Now, It’s Fueling Warming. Wildfires and thawing permafrost are causing the region to release more carbon dioxide than its plants remove, probably for the first time in thousands of years.

The thawing Arctic tundra is now adding more carbon dioxide to the atmosphere than it has removed, a reversal from the usual state of affairs since the peak of the last ice age.