This is really just more evidence of how crazy/stupid this whole debate really is. Just the fact that they’re using a 30-year average at all is ridiculous. The instrumentation to measure global temperatures accurately barely existed in the early 60’s (coverage issues, more than accuracy issues). Further, the period of ANY records of weather/climate history is barely 2,000 to 3,000 years: a small-fraction of our planet’s history. They infer the rest from scientific “tests”, where they’re loathe to share the data or methodologies.
This kind of admission demonstrates the futility of debating the climate alarmists, as their goal of controlling the setting on some master planet-Earth thermostat will never be realized. They literally get alarmed by any departure from the “norms” of the 1961-1990 period. The fact is there was nothing normal about it, when considering the long history of Earth, where the only constant HAS been change.