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Climate Change

Atmospheric Carbon Dioxide December 2026

Atmospheric Carbon Dioxide December 2026 · December 2026 · Trading open

$857 vol.
Show all 9 outcomes

About this market

Traders price Above 427 at 98%, ahead of 428.0 at 95%.

The market has $857 in volume across 189 trades; the most recent was on Oct 22, 2026.

Trading closes on Jan 5, 2027. The result is confirmed by National Oceanic and Atmospheric Administration (NOAA).

The Global Monitoring Laboratory has measured carbon dioxide and other greenhouse gases for several decades at a globally distributed network of air sampling sites. Data are reported as a dry air mole fraction defined as the number of molecules of carbon dioxide divided by the number of all molecules in air, including CO2 itself, after water vapor has been removed. The mole fraction is expressed as parts per million (ppm).

Rules and timeline

Each outcome is its own contract. A Yes contract pays $1 if its outcome happens and $0 if not; a No contract pays the reverse. Because the contracts trade separately, their chances don't have to add up to 100%.

  • Above 427Resolves Yes if Atmospheric Carbon Dioxide is greater than 427ppm in 2026.
  • 428.0Resolves Yes if Atmospheric Carbon Dioxide is greater than 428ppm in 2026.
  • 429.0Resolves Yes if Atmospheric Carbon Dioxide is greater than 429ppm in 2026.
  • 430.0Resolves Yes if Atmospheric Carbon Dioxide is greater than 430ppm in 2026.
  • 432.0Resolves Yes if Atmospheric Carbon Dioxide is greater than 432ppm in 2026.
  • 433.0Resolves Yes if Atmospheric Carbon Dioxide is greater than 433ppm in 2026.
Show rules for all 9 outcomes
  • 431.0Resolves Yes if Atmospheric Carbon Dioxide is greater than 431ppm in 2026.
  • 434.0Resolves Yes if Atmospheric Carbon Dioxide is greater than 434ppm in 2026.
  • 435.0Resolves Yes if Atmospheric Carbon Dioxide is greater than 435ppm in 2026.

Result confirmed by National Oceanic and Atmospheric Administration (NOAA).

Trading opened
Jul 30, 2024
Trading closes
Jan 5, 2027
Expected result
Jan 5, 2027
Expected payout
Jan 5, 2027

More Atmospheric Carbon Dioxide markets

Other dates in this series

Prices are the last trades on the ForecastEx exchange and can be delayed by about ten minutes. A chance is the price of a Yes contract, not a forecast by Aries. Event contracts involve risk, including the loss of the full amount paid. Information on this page is for informational purposes only and is not investment advice.