text: As for records of sea-level change, tide-gauge measurements indicate no acceleration in sea-level rise in the 20th century.24 Records of sea level, based on precise measurements made by the TOPEX/POSEIDON satellites, show a small trend of 2 mm per year in sea-level rise from 1993 to 1997.25 These measurements imply that if greenhouse gases continue to rise and the global temperature increases as much as the computer simulations say, the estimated rise in sea level over the next 100 years will be less than one foot.