Can we manipulate the weather?

Guardian
04.11.2009
By David Adam

Chinese scientists claim to be able to control the weather. But is so-called geoengineering more than wishful thinking? And, if so, should we be worried?

The unseasonal snow that fell on Beijing for 11 hours on Sunday was the earliest and heaviest there has been for years. It was also, China claims, man-made. By the end of last month, farmland in the already dry north of China was suffering badly due to drought. So on Saturday night China’s meteorologists fired 186 explosive rockets loaded with chemicals to “seed” clouds and encourage snow to fall. “We won’t miss any opportunity of artificial precipitation since Beijing is suffering from a lingering drought,” Zhang Qiang, head of the Beijing Weather Modification Office, told state media.

The US has tinkered with such cloud seeding to increase water flow from the Sierra Nevada mountains in California since the 1950s, but there remains widespread scientific sniffiness in the west at such attempts at weather control.

Such doubts have not stopped China claiming mastery over the clouds. Officials said the blue skies that brightened Beijing’s parade to celebrate 60 years of communism last month were a result of the 18 cloud-seeding jets and 432 explosive rockets scrambled to empty the sky of rain beforehand. Last year, more than 1,000 rockets were fired to ensure a dry night for last year’s Olympic opening ceremony.

“Only a handful of countries in the world could organise such large-scale, magic-like weather modification,” Cui Lianqing, a senior meteorologist with the Chinese air force, told the Xinhua news agency after last month’s parade.

Magic or not, there is growing interest in such attempts to deliberately steer the weather, and on a much larger scale. Next spring, a group of the world’s leading experts on climate change will gather in California to plan how it could be done as a way to tackle global warming, and by whom. The ideas, some of which, similar to cloud-seeding, involve firing massive amounts of chemicals into the atmosphere, can sound far-fetched, but they are racing up the agenda as pessimism grows about the likely course of global warming.

As interest grows, so does concern about whether such techniques, known as geoengineering, could be developed and unleashed by a single nation, or even a wealthy individual, without wide international approval. “What will happen when Richard Branson decides he really does want to save the planet?” asks one climate expert. If China thinks it can make cloud seeding work, then what about geoengineering?

“If climate change turns ugly, then many countries will start looking at desperate measures,” says David Victor, an energy policy expert at Stanford University and a senior fellow at the Council on Foreign Relations. “Logic points to a big risk of unilateral geoengineering. Unlike controlling emissions, which requires collective action, most highly capable nations could deploy geoengineering systems on their own.”

Victor is a heavyweight policy analyst, but one of his most impressive academic feats could have been to smuggle the name of the world’s favourite secret agent into the sober pages of the Oxford Review of Economic Policy. “Geoengineering may not require any collective international effort to have an impact on climate,” he wrote in an article published last year. “A lone Greenfinger, self-appointed protector of the planet and working with a small fraction of the [Bill] Gates bank account, could force a lot of geoengineering on his own. Bond films of the future might [enjoy incorporating] the dilemma of unilateral planetary engineering.” Move over, Goldfinger.

In a world where action on global warming has created new markets in carbon worth billions of pounds, countries are not the only players. Geoengineering would require investment and the private sector is already eyeing up opportunities. Two companies have emerged with a business plan based on dumping iron in the sea and then selling carbon offsets based on the extra pollution supposedly soaked up by the resulting algal bloom. And in their new book, Superfreakonomics, Steven Levitt and Stephen Dubner talk approvingly of Nathan Myhrvold, the former chief technology officer of Microsoft, whose company, Intellectual Ventures, is exploring the possibility of pumping large quantities of reflective sulphur dust into the Earth’s stratosphere through a patented 18-mile-long hose held up by helium balloons.

This is the point where most people will shake their heads, say the whole silly idea will never happen, and skip to the crossword. They could be right, but the global warming story has a tendency to outpace most attempts to predict its path.

A decade ago, an unproven idea called carbon sequestration, that would see carbon emissions from power stations trapped under the ground, was talked up by a small group of advocates, but was dismissed by most people as too expensive and unworkable on a large scale. Renamed carbon capture and storage, the idea is now mainstream energy policy in countries including Britain, despite still being unproven and dismissed by many as too expensive and unworkable on a large scale. Last month, the International Energy Agency said the world should build 100 full-scale carbon-capture power stations by 2020, and 850 by 2030.

If the geoengineering narrative follows a similar arc, then how long until nations or individuals that have the most to lose, or are the first to accept that the required massive emission cuts are impossible, turn to the presently unthinkable option? The US government, under President Bush, has already lobbied the Intergovernmental Panel on Climate Change to promote geoengineering research as “insurance”. When the Royal Society recently carried out an investigation of the options, senior figures privately expected it to dismiss the whole concept as nonsense. Instead the society, Britain’s premier scientific academy, concluded in September that methods to block out the sun “may provide a potentially useful short-term backup to mitigation in case rapid reductions in global temperature are needed”. The society stressed that emissions reductions were the way to go, but recommended international research and development of the “more promising” geoengineering techniques.

Of all the apparent obstacles to geoengineering, cost is not likely to be among them. Compared with the expense of investing in renewable energy and phasing out fossil fuels, the cheapest geoengineering options come with a price tag of just a few billion pounds, perhaps 1% of what it could cost to tackle global warming through emissions cuts.

Alan Robock, an expert on volcanos and climate at Rutgers University in New Jersey, has looked at how much it might cost to carry out one of the most commonly discussed geoengineering options, to mimic the cooling effect of a volcanic eruption by filling the high atmosphere with sulphur compounds, which reflect sunlight.

The eruption of Mount Pinatubo in the Philippines in 1991 threw so much shiny sulphurous dust into the atmosphere that temperatures across a shaded Earth dropped a year later by about 0.5C. The 1815 explosion of Mount Tambora in Indonesia triggered the notorious “year without a summer” and widespread failure of harvests across northern regions including Europe, the north-east US and Canada.

Robock has worked out the likely cost of technology needed to deposit a million tonnes of sulphur in the stratosphere each year, an amount equivalent to a Mount Pinatubo eruption every four to eight years, and which scientists think could be enough to cancel out the global warming caused by a continued rise in carbon emissions.

The cheapest option could be to use giant mid-air refuelling aircraft, such as the US air force’s KC-10 Extender, filled with sulphur dioxide or hydrogen sulphide gas. It would be a round-the-clock operation, with nine aircraft each required to fly three sorties a day. In a new paper in the journal Geophysical Research Letters, Robock and his colleagues say it could be done for “several billion” dollars a year. The results have forced Robock to revise a high-profile list of 20 objections to geoengineering he published last year. “It turns out that being way too expensive is not the case.”

With such a catalogue of potential disasters waiting to unfold, there must be a law against geoengineering? The international rulebook is fuzzy on this issue. The only international framework that directly covers many geoengineering techniques, the 1976 Environmental Modification Convention, designed to stop nations at war from meddling with each other’s weather, has never been tested. The 1982 UN Law of the Sea Convention and the 1967 Outer Space Treaty could be used to regulate activities and experiments in those shared spaces, but releases to the atmosphere are legally more problematic because nations have sovereignty over their own airspace.

Rather than laws and treaties, many experts argue that the best way to prevent countries or companies from going it alone is to plunge in and start serious research. “The way to tame the worst forms of unilateral geoengineering is to promote a lot more research, especially [into] the side effects,” Victor says. “One of the biggest dangers is that some governments will try to create a taboo against geoengineering. A taboo would stop a lot of research but it wouldn’t stop determined rogues. That scenario would probably be the worst, because rogues would not abandon their efforts and the rest of us would not have done enough research to know what to expect.”

Mike MacCracken, chief scientist at the Climate Institute in Washington, is organising the California meeting next spring, which aims to figure out some guidelines. He says large-scale unilateral geoengineering is “not very plausible” and his main concern is fairness to future generations. Once started by anybody, a geoengineering attempt would probably need to be continued by everybody else because it would offer a mask on global warming that could be dangerous to remove.

Read between the lines of most scientific reports on geoengineering and there is a tacit assumption that the idea sounds so extreme that merely discussing it will refocus efforts on emission cuts. But what if the reverse is true? What if a heavily funded research programme, and articles such as this, promote the idea to people who have little interest in moving to a low-carbon world?

Full article

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Telegraph
29.11.2009
By Alastair Jamieson

Jet contrails above Britain can block sunshine over 20,000 square miles

Vapour trails caused by jet aircraft over Britain can cause clouds covering 20,000 square miles, according to Met Office research, reducing sunshine by up to 10 per cent.

Analysis of contrails from one large military aircraft circling over the North Sea showed the creation of a thin layer of cloud that, at its peak, covered an area of more than 20,000 square miles.

The Met Office research suggests the collective impact of hundreds of vapour trails can cause a blanket of thin cloud, reducing sunshine for millions who live under busy flight paths.

Contrails, which are clouds of condensed water vapour and soot particles made by the exhaust of jet engines, sometimes disperse within minutes but can also be present in the sky for many hours. They can also act as a catalyst for the formation of further wispy cirrus cloud.

Globally, vapour trails are thought to cut sunshine levels by less than one per cent, but this figure could rise to 10 per cent in areas under busy air corridors, such as the south-east of England, according to The Sunday Times.

The findings echo 2003 research, led Patrick Minnis at NASA’s Langley Research Centre in Virginia, that said contrails “already have substantial regional effects where air traffic is heavy” and that the impact “may become globally significant” because of the growth in air travel.

The Met Office analysis was based on observations of a single military Awacs aircraft circling over the North Sea on a sunny day earlier this year.

Researchers had expected high-level winds to disperse its contrails but instead they appeared to attract more clouds that continued to grow as they were blown southwards until eventually they formed a hazy high-level blanket of cirrus cloud across southeast England.

Jim Haywood, the Met Office’s aerosol research manager who led the new study, told the newspaper: “At its peak the resulting cirrus cloud covered an area of more than 20,000 square miles.”

He added: “Such clouds are normally short-lived but, depending on atmospheric conditions, they can last much longer.”

It is thought that low temperatures at high altitudes can cause ice crystals in the vapour to act as ‘nuclei’ for condensation of more water, resulting in more cloud.

Mr Haywood said aviation-induced cirrus clouds had both a cooling effect, because of sunlight reflected back into space, and a warming effect, because of trapped heat.

“Studies show that, overall, the warming effect is stronger so aviation-induced clouds are helping to warm the planet,” he said.

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