Mann is contradicting the U.S. assessment directly.
He calls the statement they made a MYTH.
what is 'warming'? ... a trend. do not confuse the rate of change with the temperature level itself. You claim to be reading this stuff carefully, so reread the sentence.
There was a lot of 'warming' in the 20th century, from a base lower than average temperatures seen 800 years ago. That does NOT support U.S. assessment claims of 'highest temperature'. Read Mann's verbiage, it's practically Clintonesque in *implying* warmth (high temperature) but not saying it. "warming" does not equate to "high temperature".
Thus ...
"Mann and McKitrick do not agree "THAT LATE 20TH CENTURY IS NOT WARMEST PERIOD IN LAST 1000 YEARS" "
Who doesn't agree with this statement?
Who wants to claim that present-day earth really is warmer than back in the days the Vikings colonized Greenland?
You said. “Mann is contradicting the U.S. assessment directly. He calls the statement they made a MYTH. “
I don’t agree with how you interpret the statements.
The US Assessment says: “studies indicate that temperatures in recent decades are higher than at any time in at least the past 1,000 years." Mann says
“the level of warmth observed during the past few decades, which appear to be anomalous in a long-term context.” What he calls a myth is that some claim his work calls the 20th century the warmest, but that is clearly not so. Only the recent decades are.
Mann does not word things the way I would but he is quite clear. Also, you make the point "warming" does not equate to "high temperature". I assume that by this you are saying that warming refers to the rate which I can agree with. But Mann uses the word “warmth” when describing the recent decades, NOT “warming”. Again, that is quite clear.
You ask who doesn't agree with the following? "THAT LATE 20TH CENTURY IS NOT WARMEST PERIOD IN LAST 1000 YEARS". Just about every climatologist disagrees with that statement. The late 20th century is warmer than previous times during the last 1000 years (on a global scale).
You also ask: “Who wants to claim that present-day earth really is warmer than back in the days the Vikings colonized Greenland?”. Again, I would say most climatologists say that. Don’t confuse local with global.