@wion Yes, JMA is Japan. And no maybe it's because they use another reference period the graph gives a conservative impression? They use 1980-2010 (pretty recent). Compared for instance with Nasa-GISS that uses 1950-1980.
@wion Yes, that's correct. This is sometimes done to prevent creating the illusion that the warming is actually at a certain level right now. With a long period like 30 years it's better to center it. It's a statement about the past, not about right now.
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