Will sea level by the end of 2020 be higher than in 2019?
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According to NASA's most recent data for 2019, sea level has increased 103.52mm since 1993, as observed by satellites.
If, at 23:59 (UTC) on December 31st, 2020, the most recent data made available by NASA indicates a rise of more than 103.52mm in sea levels, this question will be resolved as "YES". If, by that time, the most recent data that NASA has published is still the one related to 2019, this question will be cancelled and all wagers will be returned to forecasters.
Source: https://climate.nasa.gov/vital-signs/sea-level/