This prediction market addresses whether 2026 will set a new global temperature record. The specific resolution criteria are based on NASA's Goddard Institute for Space Studies (GISS) Land-Ocean Temperature Index (LOTI). For a 'Yes' outcome, the unsmoothed LOTI value for 2026 must exceed both the 2025 value and the threshold of 1.28 degrees Celsius above the pre-industrial baseline period of 1880-1900. NASA GISS is a primary global temperature dataset used by climate scientists and policymakers. The market will close on December 31, 2026, and resolve shortly after NASA releases its official 2026 data, no later than April 1, 2027. Global temperature records have been broken repeatedly in recent years. 2023 was the warmest year on record, with an average temperature of 1.48°C above the pre-industrial baseline, according to the European Union's Copernicus Climate Change Service. The first half of 2024 continued this trend, with each month from June 2023 onward setting a new monthly record. This streak of record-breaking heat has focused scientific and public attention on whether the trend will persist into 2026. Interest in this market stems from the direct measurement of climate change impacts and the implications for international climate goals. The 1.28°C threshold is significant as it approaches the 1.5°C target established in the Paris Agreement, a level scientists warn could trigger more severe and irreversible climate effects. Traders are essentially betting on the trajectory of global warming, informed by climate models, current conditions like El Niño, and projections of greenhouse gas emissions.

Historical Context

The modern era of global temperature records began in the late 19th century with the establishment of widespread, standardized meteorological observations. NASA GISS's temperature record starts in 1880. For much of the 20th century, annual temperatures fluctuated but remained within a relatively narrow band. A consistent upward trend became clearly evident in the 1980s. The year 1998 was a major milestone, setting a record due to a very strong El Niño event. That record stood until 2005, and then again until 2010. Since 2014, however, the frequency of record-breaking years has accelerated dramatically. 2014, 2015, 2016, 2019, 2020, and 2023 all set new annual records. 2016 held the title as the warmest year for seven years, with a temperature anomaly of about 1.29°C above the 1880-1900 baseline, according to NASA GISS. This record was shattered in 2023, which reached approximately 1.48°C above that baseline according to Copernicus. This historical pattern shows that while natural variability like El Niño can push a specific year to a record, the underlying trend is one of sustained warming caused by increasing atmospheric concentrations of greenhouse gases from human activities. The 1.28°C threshold in this market is close to the 2016 record level, indicating that 2026 would need to reach or exceed what was, until very recently, the hottest year ever measured.

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