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On July 6, the National Snow and Ice Data Center (NSIDC) of the University of Colorado published its monthly report on the state of the polar ice caps. The Arctic ice cap, which this winter had been larger and more extensive than seen for many years, also shrank this spring at the fastest rate in years. (This chart, produced by data from the Japanese AMSR instruments on two research satellites, shows these trends very clearly.) Meanwhile, NSIDC reports that the ice cap in Antarctica is far larger than normal. Not unexpectedly, NSIDC immediately argues (quite unconvincingly if you ask me) that more ice in Antarctica is evidence for global warming.
From my perspective, the data continues to be inconclusive. We still do not really understand the long term trends of the Earth’s climate.