Michael Mann introduced a new concept of fraud to science, when he threw out the tree ring data after 1960.
Briffa’s trees (green above) accurately showed the same post 1940 cooling as the 1975 report of the National Academy Of Sciences.
Mann didn’t like that data, because his job was to eliminate the MWP. So he simply threw out the proxy data after 1960, and replaced it with Hansen’s doctored thermometer data.
Once Hansen and Mann had cleared the way for the biggest scientific fraud in history, it became possible to do the same with sea level.
A set of tide gauges (hand chosen by alarmists) indicated a steady rise in sea level of 1.8 mm/year since 1910.
The full set of NOAA tide gauges indicates a much smaller rise of about 0.7 mm, but that isn’t my point here. The 1.8 mm/year wasn’t very threatening, so our alarmist friends chose instead to simply toss the tide gauge data and replace it with corrupted satellite data which showed closer to 3 mm/year – after being tortured upwards. The blink comparator below shows how Envisat satellite sea level data was massively corrupted earlier this year to make it more suitable for propaganda purposes.
In summary, the cherry-picked set of tide gauges wasn’t good enough, so alarmists chucked their own tide gauge data, and replaced it with corrupted satellite data.
The remarkable thing though, is that even after switching systems and corrupting the new data, sea level is still rising about ten times too slow to match Hansen’s projections.