http://www.abc.net.au/news/2015-01-06/leap-second-to-make-2015-longer-year/6002002
This year may be the last time we add a leap second.
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June 30’s leap second may be the last in history.
The Radiocommunication Assembly and the World Radiocommunication Conference was due to vote later in the year on whether the leap second should be abolished.
A vote was supposed to take place in 2012, but was deferred.
The matter was controversial. Supporters of the leap second argued corrections were needed to maintain accurate time for some branches of science.
Those opposed said it was not worth the energy to change the clocks infrequently, and said it would be beneficial for computing to have a timescale that never needed changing.
A time that never changes would eventually be noticeable by humans, but not by much.
Without leap seconds there would be a slip of two to three minutes by 2100 and about half an hour by 2700.