carbon dioxide Archives - Saving Seafood

Biotech firm close to scaling up fishmeal alternative made from industrial emissions

November 23, 2020 — Having secured EUR 2.5 million (USD 3 million) from EU Horizon 2020 – European Innovation Council (EIC) accelerator funding – young U.K.-based carbon recycling biotechnology company Deep Branch is scaling up the development of new proteins for the aqua- and agri-feed sectors, produced from carbon dioxide (CO2) captured from industrial emissions.

Deep Branch’s new “Proton” single-cell protein is created through a fermentation process that uses microbes to convert CO2 into protein. The result is a low carbon feed ingredient with a nutritional profile comparable to fishmeal, which can be produced year-round, and at a price that’s on par with the traditional but finite marine ingredient market, but sporting a lower carbon footprint.

Read the full story at Seafood Source

The oceans are suffocating: Climate change is causing low oxygen levels

November 3, 2016 — Global climate change produces many effects — warming air energizes the atmosphere and intensifies storms; warmer water expands and raises sea level; storage of more carbon dioxide in the oceans is acidifying large realms. Now it is becoming clear that another, profound result of human activities is underway: lower oxygen levels in our oceans.

The world’s oceans, coastal seas, estuaries, and many rivers and lakes are experiencing declines in dissolved oxygen. Long known as an issue associated with sewage discharges and fertilizer runoff, the problem now is exacerbated by climate change, often independent of nutrient loads, and is global in scale.

If left unchecked, this decline will result in losses of fisheries and biodiversity, poorer water quality, and knock-on effects ranging from falling tourism to reduced marine ecosystem services.

In 2015, scientists from around the world formed an IOC (Intergovernmental Oceanographic Commission)-UNESCO working group called the Global Ocean Oxygen Network or GO2NE, of which I am a member. Our goals are to raise awareness about this problem, called deoxygenation, and stimulate research and policy to understand and mitigate it.

The how and why of oxygen in water

The aquatic environment holds dissolved gases; oxygen is one of them. Add in aquatic plants, a CO2 source, nutrients and light, and the resulting photosynthesis creates biomass and oxygen. Add more nutrients, and more photosynthetic production occurs. Consumers of the plant matter also use oxygen in the process and recycle the nutrients and carbon from organic to inorganic forms. This simplified cycle describes most aquatic ecosystems.

Read the full story at Salon

Cleaner fuels for fishing boats could backfire on the climate

February 5, 2016 — Fish is better than pork and beef—not just for your body, but for the planet. That’s long been the thinking, anyway. But a new study has uncovered a hidden climate impact of the fishing industry—one that, ironically, will get worse as boats switch to cleaner fuels. In some cases, the effect could make fishing for tuna as hard on the climate as raising pork, and trawling for shrimp about half as bad as raising beef.

Hogs and cattle get a bad rap because they—and their manure—emit a lot of methane, a powerful greenhouse gas. But the fishing industry also contributes to climate change: mostly from the carbon dioxide (CO2) from burned diesel fuel that persists in the atmosphere for hundreds of years. The boats produce other short-lived pollutants, such as sulfur oxides and black carbon, which have cooling and warming effects, respectively. But they have typically been neglected as unimportant in the grand scheme of things.

The new study may change that. Elliott Campbell and Brandi McKuin, environmental engineers at the University of California (UC), Merced, estimated fishing industry emissions by combining fisheries catch records with the amount of fuel typically needed to catch various species. Given the total burned fuel, they estimated the amounts of the pollutants, using information about engine types and fuel types. Black carbon, a form of soot that arises from incomplete combustion, has been underestimated by an order of magnitude in previous studies, the team reports in the Journal of Geophysical Research: Atmospheres.

Read the full story from Science Magazine

Ocean acidification poses threat to lobsters

December 18, 2015 — PROVIDENCE — Lobsters are already slowly moving out of southern New England as waters warm, but the iconic crustacean faces another future threat as the climate changes.

As oceans absorb more carbon and become increasingly acidic, juvenile lobsters likely will have a harder time growing and forming strong shells to protect them from predators, according to a recent University of Rhode Island study.

“I’m not sure yet what the mechanism is that is affecting their growth,” URI doctoral student Erin McLean, who led the research, said. “But it takes energy for them to regulate the increased acidity, which is energy they cannot then put toward growth.”

And it’s not just lobsters that could be harmed by the oceans’ changing pH levels. Shellfish populations in Rhode Island and Massachusetts in general are among the most vulnerable in the United States to ocean acidification, according to a recent study in the journal Nature Climate Change.

The study identified the two states among 15 at-risk areas in the nation because colder, northern waters, such as Narragansett Bay, Buzzards Bay and Nantucket Sound, are absorbing more carbon dioxide from the atmosphere and acidifying faster than warmer waters.

Other more localized factors are also playing a part, including nutrient pollution from fertilizers and sewage systems that can add more carbon to the water and the flow of fresh water from poorly buffered rivers, such as the Blackstone in Rhode Island or the many waterways that drain into the Gulf of Maine, which lack minerals to mitigate the effects of acid. Shallow coastal waters also are more susceptible to changes in the ocean’s chemistry.

About a quarter of all carbon emissions from power plants, cars and other sources are absorbed by the oceans, making them more acidic and reducing carbonate levels. Shellfish use carbonates to make their shells, and when fewer of the compounds are available, organisms must expend more energy to build shells and less on eating and survival, researchers say.

Read the full story at Providence Journal

Baby fish will be lost at sea in acidified oceans

December 15, 2015 — The ability of baby fish to find a home, or other safe haven, to grow into adulthood will be severely impacted under predicted ocean acidification, University of Adelaide research has found.

Published today in the journal Proceedings of the Royal Society B, the researchers report the interpretation of normal ocean sound cues which help baby fish find an appropriate home is completely confused under the levels of CO2 predicted to be found in oceans by the end of the century.

“Locating appropriate homes is a crucial step in the life cycle of fish,” says Tullio Rossi, PhD candidate with the University’s Environment Institute. “After hatching in the open ocean, baby fish travel to reefs or mangroves as safe havens to feed and grow into adults.

“Baby fish can find those places through ocean noise: snapping shrimps and other creatures produce sounds that the baby fish follow.

“But when ocean acidity increases due to increased CO2, the neurological pathways in their brain are affected and, instead of heading towards those sounds, they turn tail and swim away.”

Read the full story at Science Daily

Marine Invasive Species Benefiting from Rising Carbon Dioxide Levels

November 6, 2015 — Ocean acidification may well be helping invasive species of algae, jellyfish, crabs and shellfish to move to new areas of the planet with damaging consequences, according to the findings of a new report.

Slimy, jelly-like creatures are far more tolerant of rising carbon dioxide levels than those with hard structures like corals, since exposed shells and skeletons simply dissolve away as CO₂ levels rise.

The study, conducted by marine scientists at Plymouth University, has found that a number of notorious ‘nuisance’ species – such as Japanese kelp (Undaria pinnatifida) and stinging jellyfish (Pelagia noctiluca) are resilient to rising CO₂ levels. Published in Research and Reports in Biodiversity Studies, it notes that in the tropics, coral reefs face a host of interconnected problems (bleaching, corrosion, disease, spreading seaweed, invasive species) that are all caused by rising CO₂ levels.

Read the full story from Alaska Native News