2023 defied climate expectations. It wasn’t just hotter than predicted — it was strangely hot. Now, scientists are piecing together what caused this anomaly, raising fresh concerns about Earth’s climate systems.
Gavin Schmidt, NASA’s top climate modeller at the Goddard Institute for Space Science, admitted to feeling “humbled” by 2023’s extraordinary temperatures. Writing in Nature earlier this year, Schmidt noted that the year was warmer than models anticipated. The deviation, unexplained at first, sparked worries that climate change is entering uncharted territory.
At December’s American Geophysical Union (AGU) meeting, the world's largest Earth science conference, experts revisited the mystery. Like detectives solving a case, scientists meticulously ruled out some “suspects” while identifying others.
Key Suspects Behind the Heat Surge
El Niño
The natural El Niño event, which warms the tropical Pacific, began in 2023, contributing to global temperatures. Yet the warming exceeded even El Niño’s usual influence, raising eyebrows.
Cleaner Air from Shipping
New rules to reduce sulphur in ship fuel have lowered pollution levels. However, cleaner air allows more sunlight to reach the ocean surface, which adds to global warming.
Volcano and Solar Activity
The Hunga Tonga eruption in 2022 injected water vapour into the atmosphere but also sulphates, which slightly cooled the Earth. Meanwhile, the Sun reached its peak activity cycle, contributing minimal extra heat.
Cloud Cover Changes
Research by Germany’s Alfred Wegener Institute found Earth reflected less sunlight in 2023 — its dimmest year yet. Reduced cloud cover, particularly over northern mid-latitudes, amplified warming. Cleaner air may have played a role, alongside long-term climate shifts that are altering cloud patterns.
The Bigger Picture
Global warming is accelerating. Some scientists argue that the drop in sulphur emissions is now speeding up heating, while changing cloud dynamics add to the uncertainty.
What’s Next
GISS modellers are now combining the latest data on sulphur emissions, cloud dynamics, and sunlight reflectivity into updated climate simulations. Schmidt expects these runs to clarify the contributions of various factors and potentially reshape projections for Earth’s future.
The findings are clear: warming is unlikely to slow any time soon.
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European leaders gathered in Dublin on Thursday, 12 November, for the ninth European Political Community (EPC) summit, with security, defence and energy high on the agenda. Azerbaijani President Ilham Aliyev held talks focused on peace, trade and regional cooperation.
Iran’s Assembly of Experts has backed withdrawing from the Nuclear Non-Proliferation Treaty (NPT) and overhauling the country’s defence doctrine, calling both steps essential to national security and deterrence.
President Vladimir Putin agreed on Thursday to let European representatives join the next round of Ukraine peace talks while the United States continues to work towards what could become the largest prisoner exchange of the Russia-Ukraine war.
Microsoft struggled to restore its services on Friday after a major outage disrupted Outlook, Teams and Copilot across the United States and Asia-Pacific region.
Here's your AnewZ Technology Daily Brief for the 13th of November. This week, a Microsoft outage hit Australian agencies, Google restricted mapping data in South Korea, a lawsuit targeted advanced AI development, and Nvidia faced a leadership crisis after Jensen Huang's resignation.
Lahore, the capital of Pakistan’s eastern Punjab province, has topped global rankings of the most polluted major cities as hazardous smog continues to blanket the region.
Uzbekistan has showcased its first artificial glacier project at the COP31 climate summit in Antalya, Türkiye, highlighting an innovative way to store winter water for use in warmer months as Central Asia grapples with worsening water shortages.
Uzbek President Shavkat Mirziyoyev has allocated $10 million to reinforce the Afghan banks of the Amu Darya River, where erosion threatens farmland and homes, the Afghanistan Chamber of Commerce and Investment (ACCI) said after talks in Balkh on Tuesday.
Extreme heat is threatening agricultural production and food security in Pakistan's eastern Punjab province, where increasingly frequent and severe heatwaves are disrupting farming, damaging livestock and reducing household incomes.
Global temperatures are projected to rise by up to 2.8°C above pre-industrial levels by 2100 under current climate policies, according to a United Nations report published on 21 October, raising concerns about the world's ability to meet international climate targets.
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