evidence: In other words, we have a continuous stream of data telling us the same thing again, and again, and again: Earth's climate is changing, and it's because of the humans that populate it. It is this kind of data that should be dictating our response. [...] During previous interglacial periods, sea levels sometimes rose more than they have so far this cycle. During the last interglacial period about 100,000 years ago, sea level reached a peak 25 feet higher than it is now. I remember reading about a 65 foot higher peak sea level several cycles earlier. It is a good bet that there were some rather warm years back then, before we had record-keeping humans. And single years are probably not discernable in the geological record with the accuracy needed to make year-to year comparisons with the present. [...] NASA Earth Observatory ----------------------------------------------------------------