Coss Posted June 24, 2015 Report Share Posted June 24, 2015 Comments in green are mine. Poles apart: Climate change at the ends of the earth Wednesday, 24 June 2015, 10:10 am Press Release: Victoria University of Wellington 24 June 2015 â€œThe last time carbon dioxide levels in the atmosphere were this high was 3 million years ago, and sea levels were 20 metres higher than today.â€ Which begs the question, if all the Global Warming Alarmists are correct, why hasn't the sea risen 20 metres? The warming that's happened, and now stalled, has happened over a long enough period, to allow enough melting to have occurred, to raise the sea levels 20 metres, but curiously, I'm not seeing 20 metres, I went down to the harbour today to check. Thatâ€™s according to Victoria University of Wellington Professor James Renwick, whose sobering comment comes ahead of his upcoming inaugural lectureÂâ€”a public address to mark his professorial promotion. Tempering this stark statistic just slightly, Professor Renwick notes that, unless methods can be found soon to significantly reduce carbon dioxide levels, future generations will likely face several metres of sea level riseâ€”a prospect which will affect billions of people. What happened to 20 metres? By primarily drawing comparisons between the two poles, Professor Renwickâ€™s address, entitled A Tale of Two Hemispheres, will marry the science of man-made climate change with known natural occurrences in earth systems. The focus will be on factors such as polar geography, the ozone hole, wave patterns and natural climate variations to show that, while the planet is warming overall, the impact will affect regions differently. â€œClimate change doesnâ€™t happen at the same rate everywhere or in the same way,â€ says Professor Renwick. â€œWeâ€™re already observing obvious changes in climate in some parts of the world. Alaska, for instance, has experienced its warmest May ever, with large tracts of land having no snowÂâ€”a remarkable thing for the area at any time of year. â€œNew Zealand, on the other hand, isnâ€™t expected to feel the sharp end of climate change until much later in the century.â€ He says the differences are most apparent at the earthâ€™s poles, due primarily to different geographic profiles. â€œIn the case of the Arctic, there is almost no land mass north of latitude 70 degrees, meaning a relatively thin ice layer over the ocean. Antarctica, on the other hand, is a very large land mass, with ice up to 4 kilometres thick in some places. â€œWhile the sea ice is very obviously diminishing in the Arctic, what weâ€™re observing around Antarctica are increasing levels of sea ice. â€œAt first glance, this might seem to contradict the global warming story, but our satellite data suggests that this is likely due, in part, to the billions of tonnes of melted continent ice refreezing as sea ice.â€ So the ice still being ice, you know, frozen, means that it's not contradicting global warming? Global weather systems interacting with each poleâ€™s unique geography also influences ice development, with Professor Renwick particularly interested in the impact of La NiÃ±a and El NiÃ±o on sea ice. He is also looking at how ocean waves, which are a product of weather, might influence sea ice development. â€œIn understanding future sea levels, itâ€™s the ice sheets on the continent that are important. â€œWhatâ€™s worrying is that a lot of land ice is grounded below sea level, inland from the coast. If warming ocean water can penetrate under the ice sheets, thereâ€™s the potential to cause massive ice loss at a very rapid rate.â€ Professor Renwickâ€™s inaugural lecture is open for the public to attend. Event details: When: 6pm, Tuesday 30 June, 2015. Where: Memorial Theatre, Student Union Building, Kelburn Campus, Victoria University of Wellington RSVP by Friday 26 June. Phone 04-463 6300 or email firstname.lastname@example.org with â€˜Renwickâ€™ in the subject line. Link to comment Share on other sites More sharing options...
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