How does Direct Air Capture (DAC) differ from conventional carbon capture technology?

DAC extracts CO2 directly from the ambient atmosphere, not a concentrated industrial source. DAC extracts carbon dioxide directly from the ambient atmosphere, unlike conventional carbon capture, which pulls CO2 from a concentrated industrial source like a power-plant flue.Read more: EnvEco0066 — Direct Air Capture.

Which Swiss company, founded in 2009, is one of the best-known commercial Direct Air Capture operators?

Climeworks. Climeworks, a Swiss company founded in 2009, is one of the best-known commercial DAC operators, running large-scale plants including one in Iceland.Read more: EnvEco0066 — Direct Air Capture.

What does the abbreviation DACCU stand for?

Direct Air Carbon Capture and Utilization. DACCU stands for Direct Air Carbon Capture and Utilization — DAC paired with converting the captured CO2 into fuel or products, as distinct from DACCS (storage).Read more: EnvEco0066 — Direct Air Capture.

Roughly what concentration of CO2 must Direct Air Capture technology extract from, making it energy-intensive?

About 0.04% (roughly 400 ppm). DAC must extract CO2 from air where it makes up only about 0.04% (roughly 400 parts per million), far more dilute than an industrial flue-gas stream, making it energy-intensive and costly.Read more: EnvEco0066 — Direct Air Capture.

In aviation, how can carbon captured via DAC help reduce emissions?

It can be combined with hydrogen to produce synthetic low-carbon fuel. Captured CO2 can be combined with hydrogen to produce synthetic low-carbon fuel, a pathway explored as a way to cut aviation emissions.Read more: EnvEco0066 — Direct Air Capture.

With reference to 'Direct Air Capture', an emerging technology, which of the following statements is/are correct? 1. It can be used as a way of carbon sequestration. 2. It can be a valuable approach for plastic production and in food processing. 3. In aviation, it can be a source of carbon for combining with hydrogen to create synthetic low-carbon fuel. Select the correct answer using the code given below. [UPSC CSP 2025]

I, II and III. All three statements are correct. DAC can be used for carbon sequestration (permanent underground storage). Captured CO2 is a valuable industrial feedstock, used to produce some plastics and purified to food/beverage-grade CO2. And in aviation, captured CO2 can combine with hydrogen to create synthetic low-carbon fuel.Read more: EnvEco0066 — Direct Air Capture.

Direct Air Capture

Machines that pull carbon dioxide straight out of thin air sound like science fiction. They already exist.

A Climeworks direct air capture installation at Bundesplatz, Bern, Switzerland, 2015. DAC units extract CO2 from the atmosphere, not from a concentrated industrial source. Photo: TRx340, CC BY-SA 4.0, via Wikimedia Commons.

At a Glance

Four facts to hold on to.

Straight from air

DAC pulls CO2 from ambient air, not a flue.

Very dilute

Air holds only about 0.04% CO2.

Store or use

DACCS stores it. DACCU uses it.

UPSC 2025

All three statements were correct.

DACDirect Air Capture. Removing CO2 directly from ambient air.

DACCSDAC plus permanent storage of the captured CO2.

DACCUDAC plus use of the CO2 in fuels or products.

FeedstockA raw material fed into an industrial process.

In this lesson

Must Know: What DAC Is
Good to Know: How DAC Works
Previous Year Question

What Is Direct Air Capture?

Must Know

Straight from air, and carbon sequestration

Direct Air Capture (DAC) extracts carbon dioxide directly from the ambient atmosphere.
Conventional carbon capture pulls CO2 from a concentrated industrial source, like a power-plant flue.
Captured CO2 can be stored underground for good. It is often injected into saline aquifers or basalt formations.
This storage is a form of carbon sequestration.

Industrial feedstock, and synthetic aviation fuel

Captured CO2 is also a useful feedstock. It can be turned into some plastics and polymers.
It can be purified to food- and beverage-grade CO2 for food processing.
In aviation, captured CO2 can be combined with hydrogen. This makes synthetic low-carbon fuel.
This route is explored as a way to cut flight emissions.

True or False: Direct Air Capture extracts CO2 from the ambient atmosphere, while conventional carbon capture pulls it from a concentrated industrial source like a power-plant flue.

How Does DAC Work?

Good to Know

The ultra-dilute challenge, and Climeworks

CO2 makes up only about 0.04% of air. That is roughly 400 parts per million.
This is far more dilute than the CO2 stream at a factory chimney.
So DAC is energy-intensive and comparatively costly.
Climeworks, a Swiss company founded in 2009, is one of the best-known commercial DAC operators.
It runs large-scale plants, including one in Iceland.

Term	Full form	What happens to the CO2
DACCS	Direct Air Carbon Capture and Storage	Stored permanently, for example underground.
DACCU	Direct Air Carbon Capture and Utilization	Converted into fuel or products.

DACCS vs DACCU, and still emerging

The S in DACCS stands for storage. The U in DACCU stands for utilization.
DAC remains an emerging, small-scale technology around the world.
More research and investment are needed to make it cost-effective at a climate-relevant scale.

True or False: DACCS refers to DAC paired with converting captured CO2 into fuel or products.

True or False: Climeworks, a Swiss company founded in 2009, runs large-scale commercial DAC plants, including one in Iceland.

Exam Edge

Previous Year Question

UPSC asked about DAC in 2025.

UPSC 2025Gave three statements on Direct Air Capture and asked which are correct. The answer was all three: carbon sequestration, plastic and food-grade feedstock, and synthetic aviation fuel. Verify each statement. Do not assume at least one must be false. View this question on the full 2025 paper.

Think it through: what is the risk of assuming at least one statement must be false?

Exam questions bundle statements to test whether you know each fact. They do not always hide a trap. If you assume one DAC use must be wrong, you may talk yourself out of a correct answer. Sequestration, feedstock use, and synthetic fuel are all real uses of captured CO2. Check each statement against the technology instead.

True or False: CO2 makes up roughly 4% of air, similar to the concentration in a factory chimney’s exhaust.

True or False: Captured CO2 can be stored underground, used in plastics, or turned into synthetic aviation fuel.

Quick Q&A

What does DAC stand for?

Direct Air Capture.

How much of air is CO2?

About 0.04%, or 400 ppm.

Which letter in DACCS means storage?

The S.

Which Swiss firm runs DAC plants?

Climeworks, founded in 2009.

What fuel can DAC CO2 and hydrogen make?

Synthetic low-carbon aviation fuel.

0 / 5 correct

Direct Air Capture

What Is Direct Air Capture?

Straight from air, and carbon sequestration

Industrial feedstock, and synthetic aviation fuel

How Does DAC Work?

The ultra-dilute challenge, and Climeworks

DACCS vs DACCU, and still emerging

Previous Year Question

Quick Q&A

🎲 Practice: Direct Air Capture

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