text: The ACWT record, to quote the authors, reveals the existence of "two distinct warm periods from the late 1920s to 1950s and in the late 1980s-90s and two cold periods, one at the beginning of the record (until the 1920s) and another in the 1960s-70s." The SAT record depicts essentially the same thing, with the peak temperature of the latter warm period being not quite as high as the peak temperature of the former warm period. In the case of the ACWT record, this relationship is reversed, with the peak temperature of the latter warm period slightly exceeding the peak temperature of the former warm period; however, the most recent maximum temperature is very short-lived and rapidly declines to hover around a value that is about 1C cooler over the last few years of the record. What it means