Can carbon seize services reverse local weather change?

On a distant plateau in southwest Iceland, surrounded by darkish crags and swaths of inexperienced moss, a significant new facility has opened with the daring promise of serving to to reverse local weather change by eradicating carbon dioxide from the air.

It is the world’s greatest such complicated and, in response to its operators, will seize 4,000 tonnes of the greenhouse gasoline per 12 months in packing containers the dimensions of transport containers. This will then be funnelled deep underground to remodel – astonishingly – into innocent rock.

As world leaders meet in Glasgow for COP26, the United Nations’ local weather summit, scientists are touting this cutting-edge but pricey know-how as a key resolution to the local weather disaster.

Others warn its excessive worth and voracious urge for food for vitality are obstacles to neutralising emissions on a world scale. Its fiercest critics model it a naive and unproven tactic that provides the worst polluters a smokescreen.

But with plans underneath method for even bigger “direct air capture” operations than the one in Iceland, proponents say this pioneering know-how may help humanity to make the world carbon impartial and restrict heating to the internationally agreed goal of 1.5 levels Celsius (2.7 levels Fahrenheit).

“Direct air capture is absolutely essential for achieving net zero,” mentioned Professor Stuart Haszeldine, an skilled in CO2 storage and local weather engineering on the University of Edinburgh.

“We have to have technological solutions to get ourselves out of this problem that technology has created. I’m all in favour of planting trees and rewilding, but none of those in themselves is enough. Direct air capture, together with using much less fossil fuel, is part of the remedy.”

The CO2 seize know-how owned by the corporate Climeworks at work in Switzerland [Walter Bieri/EPA]


A half hour’s drive exterior of Iceland’s capital, Reykjavik, the carbon-capture plant in Iceland opened in September and makes use of human-sized followers to attract air into its ducts. There, CO2 builds up on a dense filter earlier than being freed by 100C (212F) blasts of warmth from renewable geothermal vitality, equipped by the island’s volcanic underbelly.

The gasoline is then dissolved in water and pumped by means of pores and cracks of basalt rock as deep as 2,000 metres (6,600 ft) beneath floor. There, it cools, reacts with minerals and, inside two years, adjustments from a climate-heating gasoline into risk-free rock.

Named “Orca” — almost equivalent to the Icelandic phrase for vitality — the commercial facility was arrange by Climeworks, a Swiss carbon seize firm, and Carbfix, an Icelandic group that specialises in turning CO2 into stone.

Personnel on the plant insist that emissions discount should go hand in hand with emissions removing.

“[This technology] does not give us an excuse for continuing with business as usual,” mentioned Sandra Ó Snæbjörnsdóttir, a geologist who oversees CO2 storage there. “Firstly, we have to not emit CO2. We have to decarbonise.”

Rising concentrations of atmospheric CO2 are forcing up world temperatures and with them a rise in droughts, floods, and different excessive climate occasions, all whereas inflicting extreme harm to ecosystems that underpin life on Earth.

Conversely, specialists say it’s not sufficient merely to cut back emissions of greenhouse gases. Substantial and sustained seize is essential too — significantly as a current UN paper discovered that governments plan to extract greater than double the quantity of fossil fuels wanted to maintain world temperatures to protected ranges.

“There is no historical precedent for the scale of the necessary transitions,” mentioned a landmark 2018 report by the Intergovernmental Panel on Climate Change. “Conceptually, it is possible that techniques to draw CO2 out of the atmosphere could contribute to limiting warming to 1.5°C.”

A mass rollout

The complicated in Iceland showcases simply considered one of a number of strategies to take away CO2 from the air. All are at totally different levels of readiness. Some require preliminary lab analysis, others are getting ready to large-scale deployment.

One approach is extra acquainted: planting timber, the unique “carbon capture hubs”. They take up atmospheric CO2 whereas boosting wildlife habitats — essential to stemming biodiversity loss and defending in opposition to flooding.

But timber take time to develop and, when making an attempt to lock away carbon indefinitely, they stay susceptible to logging, land clearance or wildfires fuelled by a deteriorating local weather. Scientists fear too concerning the large land and water necessities for this tree-planting tactic.

Experts say nature-based options are necessary however not sufficient in themselves. Yet the present scale of carbon dioxide emissions dwarfs our man-made instruments to take away them. Even as human actions launch tens of billions of tonnes of CO2 into the ambiance yearly, the brand new plant in Iceland is ready to seize simply 4,000 tonnes — a tiny fraction of this planet-heating gasoline.

Experts argue for a mass rollout of those services with far higher CO2-capturing capability.

“You’re going to need something like 10,000 of these around the world,” mentioned Haszeldine. “That sounds like a big number but that’s just the same as the number of big power plants around the world. So it’s the sort of thing that has been done already.”

These are already on the horizon. Canadian firm Carbon Engineering has earmarked Scotland and the US state of Texas for 2 large complexes and says every one will be capable of take away as much as 1,000,000 tonnes of CO2 yearly — the equal of 40 million timber apiece.

“These facilities will demonstrate that large-scale [direct air capture] technology is a feasible, affordable and available tool that is ready to help bring global emissions down to net zero, and eventually net negative,” mentioned Steve Oldham, head of Carbon Engineering.

‘Stop fossil fuel projects’

Oldham’s optimism isn’t shared by all.

Gyorgy Dallos, a local weather campaigner at Greenpeace International, argues that presenting carbon seize know-how as an answer “is at best naive and at worst dangerously cynical” — describing it as “expensive, undeveloped and unproven to work at scale”.

“It serves as a smokescreen to distract from a continuing rise in emissions,” he mentioned. “The real solution is immediate emissions reduction which means, among other things, an immediate stop to new fossil fuel projects.”

Carbon seize know-how definitely faces challenges — not least the worth. Costing upwards of $600 per tonne, the invoice for eradicating billions of tonnes of carbon dioxide can be eye-watering.

However, costs are more likely to get cheaper because the know-how improves and expands — simply as once-costly photo voltaic panels have plummeted in worth. Experts predict that the associated fee will drop to beneath $200 per tonne inside 20 years. Meanwhile, prices will be offset by promoting the harvested CO2 to agricultural, beverage or vitality firms, whether or not to develop meals, add fizz to drinks, or mix with hydrogen to make gasoline.

Another challenge is that CO2 makes up solely about 0.04 p.c of the air so requires giant quantities of vitality to extract it from huge volumes of air. Green and dependable energy sources are key.

Iceland’s excessive focus of volcanoes made the island nation an apparent alternative because of its low-cost and bountiful provide of geothermal vitality, along with the proper of rocks for CO2’s mineral storage. Those circumstances open the door to additional air seize hubs in areas as numerous as Hawaii, the East African Rift, elements of Russia and Southeast Asian nations.

But the method wants substantial portions of water in addition to the presence of porous basalt rock — broadly out there on continental margins however scarce elsewhere.

The clock is ticking and a few environmental teams stay deeply sceptical of the know-how. In a report this 12 months, Friends of the Earth dismissed Direct Air Capture as “futuristic, unproven and dangerous”, including the approach is “unlikely to ever work at scale” and warning funding in it “could even lead to greater fossil fuel extraction”.

But from the lava area in Iceland, as air is sieved of CO2 in an audacious bid to chill the planet, the trail out of the local weather disaster seems totally different.

“We don’t have any silver bullets,” mentioned Snæbjörnsdóttir. “But we do have a portfolio of solutions that, combined, can probably help us with the task ahead.”