• The Earth trapped record heat levels in 2025, impacting global climate long-term.
• All 11 hottest years recorded occurred between 2015 and 2025, with 2025 marking a particularly high temperature.
• Over 91% of excess heat is absorbed by oceans, causing significant ecological and climatic consequences.
• UN Secretary-General Antonio Guterres calls for urgent action on climate change amid escalating environmental threats.
• Future forecasts indicate continued ocean warming and potential temperature spikes in upcoming years.

The World Meteorological Organization (WMO) reported that the amount of heat trapped by the Earth reached record levels in 2025, with implications feared to persist for thousands of years. This alarming trend has seen the 11 hottest years recorded all falling between 2015 and 2025, highlighting a critical state of the global climate crisis, as communicated by the UN on March 23. Last year was determined to be "the second or third hottest year on record," approximately 1.43 degrees Celsius above the 1850-1900 average, according to Le Monde, South China Morning Post, and Channel News Asia.

UN Secretary-General Antonio Guterres expressed grave concern, stating, "The global climate is in a state of emergency. Planet Earth is being pushed beyond its limits. Every key climate indicator is flashing red." He emphasized the urgency of taking action, asserting that humanity is enduring "the 11 hottest years on record," which he described as a clear and alarming pattern rather than mere coincidence, according to South China Morning Post and Le Monde.

The WMO climate report introduced the concept of the planet's energy imbalance for the first time, indicating a significant disruption in the natural climate balance due to heightened levels of greenhouse gases such as carbon dioxide, methane, and nitrous oxide. These gases have reached "their highest level in at least 800,000 years," resulting in an increased Earth's energy imbalance since 1960, with a new high reported in 2025, as detailed by Channel News Asia, Le Monde, and South China Morning Post.

Moreover, over 91% of the excess heat is currently absorbed by the oceans, leading to significant warming effects in marine environments. The WMO has noted that the ocean heat content reached new record highs in 2025, with warming rates more than doubling compared to previous decades. These changes threaten marine ecosystems, biodiversity, and the overall efficacy of the ocean as a carbon sink, as highlighted by South China Morning Post and Channel News Asia.

The consequences of ocean warming are extensive, exacerbating severe weather patterns, such as tropical storms, and contributing to the ongoing loss of sea ice in polar regions. Reports indicate considerable loss of mass in the Antarctic and Greenland ice sheets, with Arctic sea ice extent in 2025 being recorded as the lowest or second lowest since satellite monitoring began. The global mean sea level has also seen a notable increase, approximately 11 centimeters higher than the historic baseline from 1993, as reported by Le Monde and Channel News Asia.

Looking ahead, forecasts suggest that ocean warming and rising sea levels will continue for centuries, driven partly by natural climatic variations such as La Niña and El Niño. WMO chief Celeste Saulo noted that these human-induced disruptions will have lingering effects for generations, signifying a pressing need for comprehensive climate action, according to South China Morning Post and Channel News Asia.