This claim pays (2017-x)*0.10$ with x the first year in which the mean September Arctic sea-ice extent is under 5 million km². The extent can be found at the site of the NSIDC. (http://nsidc.org/data/seaice_index/) If this source would be unavailable at the moment of payment, the judge can choose an equally credible source. If the mean September Arctic sea-ice extent is until 2017 each time higher than 5 million squared kilometers, the claim pays 0. If the mean September Arctic sea-ice extent is lower than 5 million squared kilometer in 2007 this claim pays 1.00$.
Careful: the claim talks about the Mean Arctic September sea-ice extent, not about the minimum Arctic sea-ice extent nor the sea-ice area.