Air-Scrubbing Machines Gain Momentum, But Long Way to Go

On a field ringed by rolling green hills in Iceland, fans attached to metal structures that look like an industrial-sized Lego project are spinning. Their mission is to scrub the atmosphere by sucking carbon dioxide from the air and storing it safely underground.

Just a few years ago, this technology, known as “direct air capture,” was seen by many as an unrealistic fantasy. But the technology has evolved to where people consider it a serious tool in fighting climate change.

The Iceland plant, called Orca, is the largest such facility in the world, capturing about 4,000 metric tons of carbon dioxide per year.

But compared to what the planet needs, the amount is tiny. Experts say 10 billion tons of carbon dioxide must be removed annually by mid-century.

“Effectively, in 30 years’ time, we need a worldwide enterprise that is twice as big as the oil and gas industry, and that works in reverse,” said Julio Friedmann, senior research scholar at the Center on Global Energy Policy at Columbia University.

Leading scientific agencies including the United Nations Intergovernmental Panel on Climate Change say that even if the world manages to stop producing harmful emissions, that still won’t be enough to avert a climate catastrophe. They say we need to suck massive amounts of carbon dioxide out of the air and put it back underground — yielding what some call “negative emissions.”

“We have already failed on climate to the extent to which direct air capture is one of the many things we must do,” Friedmann said. “We have already emitted so many greenhouse gases at such an incredible volume and rate that CO2 removal at enormous scales is required, as well as reduction of emissions.”