Happy Easter everyone!
Paul asked me a month ago whether Global Warming was still happening and if it was still a threat (or something similar - I was drinking his scotch neat at the time). Being a true friend, I promised him an updated analysis for this very blog on Easter Day. There is no better way to celebrate new life than to vow to protect it and the environment on which it depends.
Lowest Extent of Arctic Ice in Satellite Records
The National Snow and Ice Data Centre reported on 19 march 2015 that the winter of 2015 had the lowest ice extent since satellite records began.
The maximum extent is 1.10 million square kilometers (425,000 square miles) below the 1981 to 2010 average of 15.64 million square kilometers (6.04 million square miles) and 130,000 square kilometers (50,200 square miles) below the previous lowest maximum that occurred in 2011. This year’s maximum occurred 15 days earlier than the 1981 to 2010 average date of March 12.
Arctic Sea News
They will shortly release their analysis of the ice extents for 2015, but it is not expected to be a harbinger of an ice free Arctic in a few years. There is a lot of variability in ice extent in the Arctic. To get a better feel for the trend, the chart below shows the 2015 extent relative to other years and the median over the winter months. You can see clear fluctuation in levels, but overall a clear trend towards less ice. The climate is warming.
Antarctic Ice is getting Thinner
Scientists have been reporting that Antarctic ice sheets have grown in the last three years, and sceptics have seized on this to prove that the climate is not warming. However, what this does represent is a call to arms for scientists to understand what is actually happening. British scientists reported in February that the continent's biggest glacier has thinned by 10 metres and shrunk 5 km inland
Researchers from University College, London and the British Antarctic Survey report in Science magazine today that the Pine Island glacier, the largest in the west Antarctic, has lost 32 cubic kilometres of ice over a 5,000 sq km area since 1992. The glacier is one of the fastest in the world, flowing at 8 metres a day.
Antarctic ice cap is getting thinner
Perhaps the Arctic ice is thickening then? Not so.
The climate is warming!
Polar Jet Stream Slowing Down
Both poles have a jet stream - a high altitude wind circling the poles. Of late scientists have learned how this affects weather by moving weather systems around the globe. What does seem to be happening is that is is slowing down, and this is keeping weather systems stationary or slowed.
There is strong agreement in the scientific community that the most immediate cause of the drought in California—and western heat more broadly—is the "Ridiculously Resilient Ridge.” The RRR, as it’s called for short, is a product of unusual jetstream behavior that scientists are linking to many complex factors including Arctic warming and warmer atmospheric conditions over the northeast Pacific.
The Warm West, Cool East US Temperature Divide
As they slow, the streams meander further from the poles than before, sucking Arctic air south in some places and holding weather patterns still in others; changing climate. There are some theories to suggest this slowing is caused by the warming Arctic. More study is need to know if this is the case and what it means long term.
The Ocean is Warming
The mean air temperature has been increasing all of last century, but slowed down noticeably towards the end of the century. Where had the heat been going?
Faced with a challenge, the scientists have had to adjust their theories, and early in the new century, the theory emerged that the additional heat was going into the ocean. Theories are not enough in true scientific enquiry, so research grants were obtained to measure the ocean surface temperature. The theories were right - a tipping point in atmosphere heat had been hit and the excess was transferred down to the oceans.
What is the implication of this? That is still being determined, but one this is for certain - it will not be good. 3.5 billion people receive their primary food source from the sea. Fish are sensitive to heat, and will migrate to stay in their comfort zone. Those that can't (e.g. at the southern end of the Great Barrier Reef) will perish, or be overwhelmed by invading species.
USA Republicans Deal With Climate Science
The US Republicans are well aware of the level of scientific inquiry that climate change has brought about, and they do no like it. However, they are nothing if not resourceful.
They are about to bring the "Secret Science" act to the house. This act will require government agencies to ignore all science that is not "verified repeatable testable science". At first, this looks like a good idea. After all the point of science is that theories are testable and only accepted as long as no tests fail. However, the subtext is that climate change science is about what will happen, and it will only be repeatable if we actually heat the planet, and not once but many times. Wildlife must actually go extinct, and not once, but many times. Billions of people must actually be dislocated, not once by many times. Only then, will the GOP accept that climate change is real and a threat. But then, they will refuse to take action on it until repeatable science shows that doing something is better than doing nothing.
Of course, they will not apply the same criteria to their defence budget. In the case that the billions of dislocated people refused to die quietly on a different continent, the GOP will maintain a large defence force to deal with the unrest caused. That science is untested, but it would be crazy not to tote guns this such an apocalyptic future!
The Verdict
So, will this be the end of the world? Not at all; the world has been a lot warmer than this in the past. Perhaps the end of human civilization? Again unlikely; not all arable land will be rendered uninhabitable. Perhaps the end of the current world order? Very likely - the world order has changed dramatically every 50 years for the last few centuries? There is no reason to think that it won't do so twice more before the full impact of global warming is felt, but that would happen without global warming too. Global warming will have a devastating impact on the remaining wildlife on this planet - they have no where to go as their habitat changes. It will change our farming and fishing practices as we have to rearrange them to suit the new climate. It will result in civil unrest and war as people living in areas that get too much or too little water have to move. This could look like an apocalypse.
Unless...
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