Over the last 30 years, the globe has warmed, which no scientist denies.
Likewise, all scientists agree with the NOAA scientific climate facts: ocean warming over the 30 years ending 2013 is not "unprecedented."
Per NOAA, prior to the modern era's huge industrial/consumer CO2 emissions, the global ocean warming was significantly greater, approaching the 2 degree per century rate in 1945.
This prior exceptional warming across the world was duly noted by the mainstream press at the time (scroll down to the 1940s on this page to learn more about previous global warming).
As this accompanying chart of NOAA empirical evidence shows, the 30-year warming rate ending in 1945 was 1.6 times greater than that of the current 30-year period ending in 2013.
And this unprecedented warming of ocean waters occurred during a 30-year period when human CO2 emissions were some 85% less than the modern era (166 billion tonnes of CO2 emissions versus 784 billion tonnes for the most recent 30-year span).
The climate 'FactCheck' summary: the world's climate has experienced a declining ocean warming rate since the 1940s, which contradicts the "consensus" anthropogenic global warming hypothesis, per NOAA. Just another case of those-stubborn-facts ... modern ocean warming is not unprecedented.