This prediction market addresses whether the global average surface temperature will reach or exceed 2.0°C above pre-industrial levels before the year 2050. The threshold is measured against the 1850-1900 baseline, which scientists use as a reference for the climate before significant human influence. The market resolves to 'Yes' if at least two of the designated source agencies confirm that this temperature anomaly has occurred in any calendar year prior to January 1, 2050. This question is central to international climate policy, as the 2°C limit was established in the 2015 Paris Agreement as a guardrail against the most severe impacts of climate change. Exceeding it would signal a failure of global mitigation efforts and likely trigger more frequent and intense heatwaves, sea level rise, and ecosystem disruptions. Recent acceleration in warming rates, with 2023 confirmed as the hottest year on record, has increased scientific and public attention on this timeline. The Intergovernmental Panel on Climate Climate Change (IPCC) has stated that limiting warming to 1.5°C requires global carbon dioxide emissions to be cut by nearly half by 2030, a target currently far from being met. Investors and policymakers monitor this threshold because breaching it could have profound implications for economic stability, insurance liabilities, and geopolitical security. The market provides a mechanism to aggregate expert and public sentiment on the probability of this event occurring within the next quarter-century.

Historical Context

The concept of a 2°C limit for global warming emerged in the 1970s, but gained political traction in the 1990s. Economist William Nordhaus is often credited with proposing 2°C as a reasonable upper limit in a 1977 paper. The limit entered formal policy discussions in 1996 when the European Union's Council of Environment Ministers endorsed it as a long-term objective. It was subsequently referenced in the 2009 Copenhagen Accord, a non-binding political agreement. The 2015 Paris Agreement, adopted by 196 parties, made the 2°C limit a central, legally enshrined goal, with an aspirational target of holding warming to 1.5°C. The agreement commits nations to submit Nationally Determined Contributions (NDCs) outlining their emissions reduction plans. Historically, global temperature has not been this high for millions of years. The last time Earth's temperature consistently exceeded 2°C above pre-industrial levels was during the Pliocene Epoch, roughly 3 million years ago, when sea levels were estimated to be 10-20 meters higher than today. Since the industrial revolution, global temperature has risen at an unprecedented rate, with roughly half of the total increase occurring since the 1970s. Each of the last four decades has been successively warmer than any decade since 1850.

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