Newcastle Herald Letters to the Editor: Friday, June 14, 2019

June 14 2019 - 12:30am
SHIFTS: The Jakobshavn glacier was reported to have gained mass due to a periodic shift in currents and is not an accurate measure of climate change, argues one reader.
SHIFTS: The Jakobshavn glacier was reported to have gained mass due to a periodic shift in currents and is not an accurate measure of climate change, argues one reader.

I NOTE John Mulhearn's assertion that "The northern hemisphere had a severe winter with Greenland ice caps increasing in size" (Letters, 11/6). To clarify what I believe he is referring to, a single glacier (the Jakobshavn glacier) was reported to have gained mass over the past three years due to a periodic shift in ocean currents called the North Atlantic Oscillation. This short-term increase in ice thickness has not reversed the total ice loss in that glacier documented over the previous two decades due to global warming. Meanwhile, Greenland's entire ice sheet has continued to melt at a rate that has been unprecedented for centuries. The progress of global warming, unfortunately, can not be predicted or denied by a single glacier or a single cold day. The scientific evidence has been evaluated comprehensively in the reports produced by the Intergovernmental Panel on Climate Change which cites a wide variety of interdisciplinary research. The best available evidence over the last three decades indicates that slowly but surely the world is heating, and unless we act urgently to reduce greenhouse gas emissions our children face an unhealthy future due to climate breakdown.

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