No 1994 Posted by fw, June 28, 2017
“If the amount of the gas that people are putting out has stopped rising, how can the amount that stays in the air be going up faster than ever? Does it mean the natural sponges that have been absorbing carbon dioxide are now changing?…. if global emissions flattened out at today’s high level, the world would still be in grave trouble…. ‘If emissions were to stay flat for the next two decades, which could be called an achievement in some sense, it’s terrible for the climate problem…’” —Justin Gillis, New York Times
Why is the news alarming? If the natural sponges that absorb CO2 are weakening, the amount of carbon dioxide in the atmosphere would rise faster, accelerating global warming, further destabilizing the weather, causing the seas to rise, and threatening the polar ice sheets. Scientists say their inability to know for certain what is causing this dangerous trend is a reflection of the scientific difficulty of the problem, but also of “society’s failure to invest in an adequate monitoring system to keep up with the profound changes humans are wreaking on the planet.”
With the US and Australia cutting their funding for climate monitoring and research, the climate impacts will intensify.
Below is a slightly abridged repost of NYT’s article with my added subheadings and text highlighting. To read the piece on the Times’ website, click on the following linked title.
CAPE GRIM, Tasmania — On the best days, the wind howling across this rugged promontory has not touched land for thousands of miles, and the arriving air seems as if it should be the cleanest in the world.
But on a cliff above the sea, inside a low-slung government building, a bank of sophisticated machines sniffs that air day and night, revealing telltale indicators of the way human activity is altering the planet on a major scale.
If CO2 emissions have stabilized, why are cumulative amounts of carbon in the atmosphere increasing faster than ever?
For more than two years, the monitoring station here, along with its counterparts across the world, has been flashing a warning: The excess carbon dioxide scorching the planet rose at the highest rate on record in 2015 and 2016. A slightly slower but still unusual rate of increase has continued into 2017.
Scientists are concerned about the cause of the rapid rises because, in one of the most hopeful signs since the global climate crisis became widely understood in the 1980s, the amount of carbon dioxide that people are pumping into the air seems to have stabilized in recent years, at least judging from the data that countries compile on their own emissions.
That raises a conundrum: If the amount of the gas that people are putting out has stopped rising, how can the amount that stays in the air be going up faster than ever? Does it mean the natural sponges that have been absorbing carbon dioxide are now changing?
“To me, it’s a warning,” said Josep G. Canadell, an Australian climate scientist who runs the Global Carbon Project, a collaboration among several countries to monitor emissions trends.
Scientists have spent decades measuring what was happening to all of the carbon dioxide that was produced when people burned coal, oil and natural gas. They established that less than half of the gas was remaining in the atmosphere and warming the planet. The rest was being absorbed by the ocean and the land surface, in roughly equal amounts.
In essence, these natural sponges were doing humanity a huge service by disposing of much of its gaseous waste. But as emissions have risen higher and higher, it has been unclear how much longer the natural sponges will be able to keep up.
Too early to tell if nature’s natural sponges – ocean and land surface – have weakened?
Should they weaken, the result would be something akin to garbage workers going on strike, but on a grand scale: The amount of carbon dioxide in the atmosphere would rise faster, speeding global warming even beyond its present rate. It is already fast enough to destabilize the weather, cause the seas to rise and threaten the polar ice sheets.
The record increases of airborne carbon dioxide in 2015 and 2016 thus raise the question of whether this has now come to pass. Scientists are worried, but they are not ready to draw that conclusion, saying more time is needed to get a clear picture.
Has El Niño caused faster-than-usual rise in CO2 by drying out large parts of the tropics?
Many of them suspect an El Niño climate pattern that spanned those two years, one of the strongest on record, may have caused the faster-than-usual rise in carbon dioxide, by drying out large parts of the tropics. The drying contributed to huge fires in Indonesia in late 2015 that sent a pulse of carbon dioxide into the atmosphere. Past El Niños have also produced rapid increases in the gas, though not as large as the recent ones.
Yet scientists are not entirely certain that the El Niño was the main culprit; the idea cannot explain why a high rate of increase in carbon dioxide has continued into 2017, even though the El Niño ended early last year.
Scientific uncertainty is a reflection of government failure to invest in research
Scientists say their inability to know for certain is a reflection not just of the scientific difficulty of the problem, but also of society’s failure to invest in an adequate monitoring system to keep up with the profound changes humans are wreaking on the planet.
“It’s really bare bones, our network, contrary to common misperceptions about the government wasting money,” said Pieter Tans, chief of a unit that monitors greenhouse gases at the National Oceanic and Atmospheric Administration.
While the recent events have made the scientific need for an improved network clear, the situation may be about to get worse, not better. President Trump’s administration has targeted American science agencies for cutbacks, with NOAA, the lead agency for tracking greenhouse gases, being one of those on the chopping block.
Australia also had a recent fight over proposed cutbacks in climate science, but so far that country’s conservative government has promised continued funds for the Cape Grim science program, Australia’s most important contribution to global climate monitoring. The atmospheric observatory here, which receives some money from NASA, is one of the most advanced among scores of facilities around the world where greenhouse gases and other pollutants are monitored.
The network is complete enough to give a clear picture of the overall global trends in industrial gases in the air, scientists say. But it is too sparse to give definitive information about which parts of the planet are absorbing or releasing greenhouse gases at a given moment. Lacking such data, scientists have trouble resolving some important questions, like the reasons for the rapid increase of carbon dioxide over the past three years.
“It’s really important that people get that there’s an awful lot that’s just not known yet,” Sam Cleland, the manager of the Cape Grim station, said.
Human activity is pumping upwards of 40 billion tons of CO2 into the air annually
Human activity is estimated to be pumping almost 40 billion tons of carbon dioxide into the air every year, an amount that Dr. Canadell of the Global Carbon Project called “staggering.” The atmospheric concentration of the gas has risen by about 43 percent since the Industrial Revolution.
CO2 accumulation in the atmosphere has warmed the earth by about 2 degrees Fahrenheit
That, in turn, has warmed the Earth by around 2 degrees Fahrenheit [about 1.12°C], a large number for the surface of an entire planet.
With a better monitoring network, scientists say they might be able to specify in greater detail what is causing variations in the amount of carbon dioxide staying in the air — and, perhaps, to give a timely warning if they detect a permanent shift in the ability of the natural sponges to absorb more.
China’s effort to cut emissions may account for emissions to have levelled off
The uncertainty stemming from the recent increases in carbon dioxide is all the more acute given that global emissions from human activity seem to have stabilized over the past three years. That is primarily because of changes in China, the largest polluter, where an economic slowdown has coincided with a conscious effort to cut emissions.
“I’d estimate that we are about at the emissions peak, or if there are further rises, they won’t be much,” said Wang Yi, a professor at the Chinese Academy of Sciences in Beijing, who also belongs to the national legislature and advises the government on climate policy.
But climate Denier-in-Chief Trump may cause emissions to rise again
Emissions in the United States, the second-largest polluter after China, have also been relatively flat, but Mr. Trump has started tearing up President Barack Obama’s climate policies, raising the possibility that greenhouse gases could rise in coming years.
Even if emissions remained flat for next 20 years, it’s still “terrible for the climate problem”
Dr. Tans said that if global emissions flattened out at today’s high level, the world would still be in grave trouble.
“If emissions were to stay flat for the next two decades, which could be called an achievement in some sense, it’s terrible for the climate problem,” he said.
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