Don,
“Everything I have read about SST gives me much less confidence that we know anything about temperatures in and over the oceans even now, and hardly at all for the 20th century.”
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From BEST FAQ site:-
http://berkeleyearth.org/FAQ.php
“What is next for Berkeley Earth?”
“As a next step, Berkeley Earth plans to address the total warming of the oceans, with a view to obtaining a more accurate figure for the total amount of global warming observable.”
Last I heard from JC was that funding was not yet in place for “next”. Maybe that has changed?