3D Ocean Farms with Bren Smith of GreenWave

Scientific concepts, discoveries, and nature phenomena

• Marine ecosystem degradation from fishing

  • Factory trawl fishing can “tear up entire ecosystems.”
  • Cod stock collapse is cited as a driver for shifting toward aquaculture.

• Problems with conventional aquaculture

  • Farming salmon and halibut is described as creating local pollution.
  • The use of antibiotics is mentioned.
  • Concern that the industry may not produce “fish nor food” in a net sense (i.e., ecological cost and inputs).

• 3D Ocean Farming (vertical, full-water-column polyculture)

  • Uses a vertical growing system (scaffolding/lines) that occupies multiple ocean depths:
    • Kelp suspended along lines
    • Shellfish (oysters, clams, mussels, scallops) grown on/near structures and in/near the mud/sea floor
  • Designed to use hurricane-resistant anchors and a small surface footprint (low visual/aesthetic impact).

• Bioremediation / nutrient cycling

  • Oysters: filter large volumes of water and remove nitrogen, linked (in the talk) to the cause of dead zones.
  • Kelp: described as carbon-removing with high sequestration; compared to a “sequoia of the sea.”

• Climate and carbon concepts

  • Negative carbon footprint for kelp is asserted.
  • Kelp is described as a strong carbon sink relative to land plants (including a “soaks up” claim of multiple times more carbon).
  • Kelp is also described as a source for biofuel (ethanol) with higher yield per acre than corn (as stated).

• Storm protection and habitat creation

  • Farms function as storm surge protectors.
  • Structures act as artificial reefs, supporting biodiversity by hosting species that “come hide, thrive, and eat.”

• Food system / biological feed substitution

  • Kelp replacing land-based feed/fertilizers is proposed as an ecological improvement.
  • A methane-reduction claim is made: cattle fed a majority kelp-based diet can reduce methane output (stated as ~90%).

• Diversification to reduce climate variability risk

  • Instead of large monoculture-like production, the approach emphasizes diverse species and distributed production to handle year-to-year ocean variability.

---

Methodology / operational approach (as described)

Farm structure

• Create submerged vertical scaffolding with:
  • Surface-to-subsea anchors
  • Lines suspended by buoys
  • Bottom shellfish components on/near the sea floor (e.g., oyster cages in the mud/at the seabed)
  • Kelp grown in-season along the lines
  • Additional shellfish (clams, scallops, mussels) attached/contained on the system

Polyculture crop mix

• Two types of seaweeds and four kinds of shellfish (exact types partially implied: kelp, plus multiple shellfish species mentioned).
• Harvesting sea greens and shellfish together.

Scaling model and governance

• Operate through Green Wave (hybrid for-profit/nonprofit).
• Open-source the model (not franchised/patented), aiming for replication by other farmers.
• Use a farmer training + startup grant program:
  • Training period (stated as two years)
  • Access to seed and support
  • Guaranteed buyer arrangement (buying ~80% of crops) at triple market rate initially (3–5 years)

Market and infrastructure support

• Build seafood hubs, hatcheries, and other infrastructure (e.g., coops).
• Create institutional/social-entrepreneur networks and expand every ~200 miles along coasts (vision stated).
• Establish demand via chefs/restaurants and partnerships; use byproducts for pet food and fertilizers (stated as ongoing work).

Community / permit strategy

• Stakeholder engagement and careful site selection
• Start with small/visible pilot lines so people can visually confirm safety and benefits
• Emphasize aesthetics and low-impact architecture to ease permitting

Risk management

• Promote many small farms rather than huge single farms to avoid concentration risk and reduce permitting/community backlash.

---

Featured researchers or sources (named at the end / in the subtitles)

• Dave Blaney (mentioned as involved in the farmer training program)
• Sherman (mentioned alongside Dave Blaney; likely a person involved in training—name appears incomplete/unclear in subtitles)
• The New Yorker (cited as publishing an article comparing kelp to an “electric car”)
• GreenWave / Bren Smith (main speaker; organization referenced throughout)

(No other individual researchers are clearly named beyond those above.)