New temperature comparisons using ocean-going robots suggest climate change began much earlier than previously thought
UK Daily Mail
April 2, 2012
Itâ€™s widely believed that global warming began in the 1970s, but new ocean temperature readings show that the Earth has in fact been warming for far longer.
A study by the Scripps Institution of Oceanography in San Diego traced ocean warming to the late 19th century, which implies, say researchers, that the Earthâ€™s climate as a whole has been heating up since then.
The report is the first global comparison of temperature between the historic voyage of HMS Challenger between 1872 and 1876 and modern data obtained by ocean-probing robots now continuously reporting temperatures via the global Argo program.
The research, led by oceanographer Dean Roemmich, shows a .33C (.59F) average increase in the upper portions of the ocean to 700 metres (2,300 feet) depth.