Burning Fossil Fuels or Tropical Deforestation, which is causing Glacial Acceleration?

The darker the shading, the more
days of summer melting are happening today
compared to the base year of 1988.
(Photo: NASA)

Editor’s Note: Our committment to providing a forum for all points of view is not part of an attempt to hide our own beliefs. Regarding climate change, we believe changes in land use – tropical deforestation in particular – are of equal or greater significance than anthropogenic CO2 emissions. We further believe steps to reforest the tropics are far more feasible than reducing CO2 emissions. And we are appalled that well-intentioned policy makers, particularly in Europe, have allowed CO2 offset credits to fund subsidies for biofuel which has been the primary cause of accelerated rainforest destruction in recent years.

In general, we believe using the biosphere (which can barely provide the 17 quadrillion BTUs of caloric energy per year that 6.2 billion people require) to grow biofuel – in order to make a dent in the 550 quadrillion BTUs of yearly energy for our technosphere – is absolute folly. Quite simply, in our rush to avoid using fossil fuels, we are destroying the world in order to save it.

In the article to follow, written by one of the most respected environmental journalists in the world today, his message is clear – Greenland’s ice sheet is melting faster than any earlier predictions and the current rate of melt could possibly cause sea level rise of up to two meters within this century. We believe the phenomenon of icecap melting is something that requires vigilant monitoring, but we disagree with the suggestion that sea levels could rise two meters within this century.

Notwithstanding everything we’ve already reported on this topic, most of which the reader can find in our Global Warming category, here are some additional recommended readings: “What if All the Ice Melts?” by Robert Johnson, “You Will Still Need Your Parka in Antarctica,” by Lawrence Solomon,” and “Greenland Icecap May be Melting at Triple Speed,” by Kelly Young. These stories agree on most data, but reach wildly different conclusions. In all cases it is acknowledged that there are about 29.3 million cubic kilometers (km3) of land based ice on earth, and that about 26 million km3 of that is in Antarctica, with most of the rest, 2.9 million km3, atop Greenland. But here is where conclusions differ:

In the above-referenced article “Greenland Icecap May be Melting at Triple Speed” the author notes that recent measurements of 80 km3 of net icecap loss per year may have been understated, and that in reality 240 km3 of net yearly icecap loss may have occurred in recent years. But basic algebra indicates that it would still take over 12,000 years for Greenland’s icecap to melt at this rate, and it would take 4,000 years for Greenland’s net loss of ice, at this rate, to raise sea levels by two meters – not the end of this century, but sometime in the distant future. And it isn’t clear this rate of melt will accelerate inexorably – according to polar temperature records, if the multi-decadal oscillation stays on schedule, the arctic will begin to cool again sometime between 2015 and 2035.

In any case, it isn’t necessarily what happens to Greenland, with 10% of land based ice, that matters. It is what happens in Antarctica, and there are no reports so far that indicate the Antarctic icecap is losing mass, and in fact there are reports that suggest Antarctica is gaining ice mass. Small percentage increases in Antarctic ice mass will cancel out anything happening in Greenland. Less than 1% of land-based ice is outside of Greenland or Antarctica. Thermal expansion of the ocean may be offset by increased evaporation.

The point of all this isn’t to skewer the message in the story below. Unlike many if not most parties to what remains of this debate, we only want a revitalized and reasoned debate regarding the extent and the causes of climate change – and what to do about it! And we recommend the CO2 alarmists turn some of their wonderful and well-intentioned passion to stopping the catastrophe unfolding as we decimate the rainforests of the Americas, Africa and Asia to grow fuel. In our humble opinion, if tropical deforestation is not stopped and reversed, the consequences for our climate will be far worse than if we continue to burn fossil fuel. If Greenland’s icecap does melt someday soon – perhaps it will be because within a few short decades we dried and heated the millions of square miles of equatorial land mass, because we cut down the tree canopy for biofuel plantations, because someone thought that would actually reduce CO2 emissions.

- Ed “Redwood” Ring

Glacial Acceleration – A Sea of Troubles
by Paul Brown, November 27, 2007
Meltwater stream flowing into a
large moulin
in the ablation zone
of the Greenland ice sheet.
(Photo: NASA)

It is hard to shock journalists and at the same time leave them in awe of the power of nature. A group returning from a helicopter trip flying over, then landing on, the Greenland ice cap at the time of maximum ice melt last month were shaken. One shrugged and said: “It is too late already.”

What they were all talking about was the moulins, not one moulin but hundreds, possibly thousands. “Moulin” is a word I had only just become familiar with. It is the name for a giant hole in a glacier through which millions of gallons of melt water cascade through to the rock below. The water has the effect of lubricating the glaciers so they move at three times the rate that they did previously.

Some of these moulins in Greenland are so big that they run on the scale of Niagara Falls. The scientists who accompanied these journalists on the trip were almost as alarmed. That is pretty significant because they are world experts on ice and Greenland in particular.

We were visiting Ilulissat, Greenland, once a stronghold of Innuit hunters but now with so little ice that the dog sleds are in danger of falling through even in the depth of winter.

But it is not the lack of sea ice that worries scientists and should be of serious concern to the inhabitants of coastal zones across the world. Cities like New York and states like Florida are in the front line.

Scientists know this already, but just to give you some idea of the problem, the Greenland ice cap is melting at such a fast rate it is triggering earthquakes as pieces of ice several cubic kilometres in size break up.

Scientists say the acceleration of melting and subsequent speeding up of giant glaciers could be catastrophic in terms of sea level rise and make previous predictions published this year by the Intergovernmental Panel on Climate Change (IPCC) far too low. The glacier at Ilulissat, which it is believed spawned the iceberg which sank the Titanic, is now flowing three times faster into the sea than it was 10 years ago.

Robert Correll, chairman of the Arctic Climate Impact Assessment, from Washington told me: “We have seen a massive acceleration of the speed with which these glaciers are moving into the sea. The ice is moving at 2 metres an hour on a front five kilometres long and 1,500 metres deep. “That means that this one glacier puts enough fresh water into the sea in one day to provide drinking water for a city the size New York or London for a year.”

Professor Correll, who is also director of the global change programme at the Heinz Centre in Washington said the estimates of sea level rise in the IPCC report in February 2007 had been “conservative” and based on data two years old. The range of rise this century had been predicted to be 20 to 60 centimetres, but would be the upper end of this range at a minimum and some now believed it could be two metres. This would have catastrophic effects for European and US coastlines.

He said newly invented ice penetrating radar showed that the melt water was pouring through to the bottom of the glacier creating a melt water lake 500 metres deep causing the glacier “to float on land. “These melt water rivers are lubricating the glacier, like applying oil to a surface and causing it to slide into the sea. It is causing a massive acceleration which could be catastrophic.

The glacier is now moving at 15 kilometres a year into the sea although in periodic surges it moves even faster. He has seen a surge, which he had measured as moving five kilometres in 90 minutes – an extraordinary event.

If all of Greenland melts, something we were previously assured would take thousands of years, but now could be hundreds, then sea level round the world would rise seven metres. That is without any contribution from the Antarctic, the glaciers of Alaska, the Rockies, the Himalayas, or the ocean water expanding as it warms.

So the talk of sea level rise should not be in centuries, it should be decades or perhaps even single years. For 10,000 years, during all of human civilisation sea level remained stable leading us to believe that coastlines remained roughly in the same place. A century ago the sea began to rise one millimetre a year, 20 years ago it had reached two millimetres and this century it has risen to 3 millimetres. This annual rise may not seem much but add hurricane storm surges and high tides and we are soon saying good bye to a lot of coastal settlements like the Big Apple.

CHINA, USA, INDIA – 1995 vs. 2005
Energy Chart Between China, the United States, and India
In 2007 China’s CO2 emissions passed the USA, though
China and the USA currently have virtually identical
energy intensity (energy consumed per unit of GNP).

Switch forward a week from the helicopter ride to George W. Bush’s meeting of 16 of the biggest greenhouse gas emitters in Washington last month and what do we hear. We hear lots of rhetoric about how, along with terrorism, climate change is the biggest threat to the earth although the catastrophic sea level rise facing our major coastal cities does not rate a mention.

But instead of decisive political action (as with terrorism) we get suggestions from the President of voluntary cuts in emissions, down to the government of each country, and then next summer another conference to discuss where we have got to which on past form will be nowhere at all. It did not sound like the much needed change of heart from the President, but just another delaying tactic to tide him over until his term of office ends.

Although it may sound like it, the commentators in Europe are not singling out America for criticism, although it has to be said as often as possible that the US is the world’s most profligate nation when it comes to fossil fuel consumption, AND has rejected the only legally binding international agreement that could do something about it. But Europeans are not doing enough either. We need convincing that our own leaders have enough political will to reach the tiny Kyoto targets that are the minimum first step to tackling this problem. The public hears the latest scientists warnings that an 80% cut in greenhouse gas emissions is needed if we are to stave off catastrophic climate change, yet wait in vain for the policies needed to achieve them.

In my book, protestors wearing George Bush masks are pictured “fiddling while the earth burns.” Maybe he is just the lead violinist of the orchestra.

Paul Brown Portrait

About the Author: Paul Brown was the environment correspondent for The Guardian newspaper for 16 years and has worked in newspaper journalism for more than 40 years. He has written extensively about climate change, population, biodiversity, pollution, energy, desertification, and ocean management. Brown has appeared in and written television documentaries on environmental issues, contributed to books on green politics, and is the author of several books on the environment, ref. Global Warming Book.

EcoWorld - Nature and Technology in Harmony

Leave a Reply

You must be logged in to post a comment.