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this post was submitted on 11 Sep 2023
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Not exactly. Most references to 1.5C are about the long term average hitting that level, not an individual year.
Given the trend, it's a pretty strong indicator we're there. What is long-term in the context of a change over 10-20 years, that's reaching a breakaway point?
You understand that when things are steadily moving in one direction, we'd need to overshoot the difference between the start of the reference period and the 1.5 degree figure by 100%(incorrectly assuming linear change - the reality is more exponential - far worse by the time it shows up)
For example - for a 1.5C change over 6 years, starting at 0C:
Year 0 - real temp 0, average 0
Year 3 - real temp 1.5, average 0.75
Year 6 - real temp 3, average 1.5
The year to year variation is much larger than the underlying increase. We could easily see several years with the anomaly under 1.5C before