evidence: At first, only a few isolated tide-gauge records are discussed. Mainly because of ocean dynamics, local and regional sea level shows large decadal and multi-decadal variations, and therefore it is indeed difficult to find an acceleration in a single tide gauge record. Only European and US tide-gauge records are shown. Because these tide gauges are relatively close to the places where most of the ice melt that has driven sea-level changes since ~1900, they will see much less sea-level rise from ice melt than the global mean due to gravity and solid-Earth effects. Therefore, without explicitly taking this into account, we cannot say anything about global sea levels based on records in Europe and North America alone. When all available tide-gauge records are combined to compute global sea levels, a clear acceleration in sea level since 1900 is visible[2]. Combined with longer proxy records, the data shows that global sea levels have risen at a faster pace than any other century over the last 3,000 years, and that the 21st-century rate of global sea level is already three times as high as the twentieth-century rate[3].