TAKEWAYS from Associated Press Report on attempts to catch carbon in the ocean

Halifax, Nova Scotia (AP) – is running for a solution engineer for global warming using the exploitative power of an increasing industry oceans.

Dozens of companies and academic groups are pitching the same principle: rocks drowning in the sea, nutrients, crop waste or maritime algae-wise carbon dioxide can shut down for centuries or more. There have been about 50 field trials in the last four years, in which startups have raised hundreds of million in early funds.

But the area prevails with debate on results for oceans if strategies are deployed extensively, and on the exact advantage to climate. Critics say that efforts are moving very quickly and with very little railings.

Here are the takeaways from the Associated Press report on companies seeking to exploit the world’s oceans to catch carbon.

What is the problem?

Most climatic models suggest that emission cuts will not be sufficient to curb global warming. The world also needs to remove heat-tripping gases.

Money has inserted into separate strategies on the ground – among them, pumping carbon dioxide from air, developing sites to store carbon underground and re -fill the forests, which naturally store CO2. But many of those projects are limited by space and can affect nearby communities.

How can the ocean help?

The ocean controls the Earth’s climate by already absorbing heat and carbon, and by comparing, it seems infinite.

“Is that spacious surface area an option that helps us deal with and reduces the worst effects of climate change?” Asked Adam Subhash, who is leading an Ocean Carbon Project with the Cape Cod, Woods Hole Oceanographic Institution based on Massachusetts.

How does science work?

Most companies appearing up to be offshore for climate solution are trying to reduce or replace carbon dioxide stored in the sea. If they can achieve this, the company will act as a “a vacuum” to absorb more gases than the main ocean scientist for planetary technologies, ocean air.

The planet uses magnesium oxide to create that vacuum. When dissolved in seawater, it converts carbon dioxide into stable molecules from gas that will not interact with the atmosphere for thousands of years. Lime stone, olivin and other alkaline rocks have the same effect.

Other companies focus on growing seaweed and algae. These sea organisms act like plants on the land, absorb carbon dioxide from the sea such as trees do it from air.

Nevertheless, others see the deepest parts of the sea as a place to store biological materials that will emit greenhouse gases when left on the ground.

How is the efforts being financed?

Most ocean startups are selling carbon credits – or tokens represent a metric ton of carbon dioxide removed from the air. Large -scale irregular and widely debated, carbon credits have become popular in this century, for companies to buy an offset instead of reducing emissions in a way.

According to the tracking site CDR.Fyi, the industry sold over 340,000 maritime carbon credits last year, which was from 2,000 credits four years ago. But the quantity of carbon removal is a small fraction that scientists say that it will be necessary to keep the planet living in the coming centuries.

How did people react to efforts?

The coastal communities are not always hurry to jump on the board.

In Northern Carolina, the request to dump the ship load of Olivin near the beach city of Duck found questions that reduced the project to more than half.

Fishing communities have opposed another project led by Subhas of Woods Hole Research Center.

Research director Sarah Nawaz at the American University Institute for Responsible Carbon Removal said that she understands why scientists sometimes struggle to join communities and gain their support. Initial research suggests that the public is reluctant to the idea of ​​climate “engineering”.

What are other challenges?

The ocean is a dynamic, challenging landscape to work. Scientists are still highlighting new details of how it absorbs and recycle carbon, and whatever material they add to sea water, they are responsible for sink, dilute or wash in other places, challenging challenging challenges to track how the ocean reacts.

Katja Fennell, chairman of the Oceanography Department at Dalhousie University, said, “We cannot measure every time, where she works on modeling how much carbon planets have occupied in her project in Halifax Harbor.

Questions also arise on how long the carbon capture will last. It is particularly important for companies working with algae, wooden chips or other organic materials, because where they disintegrate, they can leave carbon dioxide back into the atmosphere.

Even if these solutions do long -term work, most companies are working on a very small scale to affect the climate. Extending to meet the current climate goals will take large -scale resources, energy and money.

“The question is, what happens when you increase it to billions of tons every year?” A Oceanography Professor David Ho at the University of Hawaii in Manoa said and the co-founder and Chief Science Officer of the non-profit (C) Worth, who works on verifying the effects of ocean-based carbon removal.

Planetary’s burt imagines a future in which minerals are pumped through power plants and water treatment facilities on every major coast of the world. But this will require a large, stable amount of magnesium oxide or similar minerals, as well as energy to mine and transport.

Marine algae and algae development will need to be expanded rapidly. National Academies of Sciences, Engineering and Medicine have speculated that about two-thirds of the world will need to be surrounded by Celp, even to start to make a dent in global warming. The company Caphields, which is running a test at Caribbean, states that it constructs a wide Sargsum farm over 200 miles between Brazil and West Africa.

There are risks that these expansion increase environmental damage that is not detected in small trials, and due to global water circulation, can be felt worldwide.

But at any time to try, Ho said, climate change has been uncontrolled.

The story was supported by funding from the Walton Family Foundation. AP is completely responsible for all materials.

Contact AP’s global investigative team.