Could crushed rocks absorb enough carbon to curb global warming?

After planting clams in Shinnecock Bay in 2012, scientists at Stony Brook University were able to reverse the trends of red tide in the coastal New York waters. The bay restoration project resulted in 400,000 square meters of seagrass regrowth and the local clam population significantly grew.

Vaan Island, off the coast of Indian in the Gulf of Mannar, is rapidly sinking. But scientists are working to prevent that erosion by replanting seagrass, which is an important plant in a marine ecosystem. Despite fishermen pulling up the seagrass with their nets, so far, nine acres of seagrass have been rehabilitated in the area.

SEEDS has successfully scaled mangrove restoration from 5,500 to 415,000 saplings by training 17 women's self-help groups to earn income from planting and managing mangrove nurseries, creating a sustainable "ecology as economy" model that both protects communities from increasingly severe cyclones and provides dignified livelihoods without forcing migration.

Researchers from Real Ice, a United Kingdom-based climate-focused nonprofit, are piloting an ice-sheet conservation project that pumps ocean water to freeze on top of preexisting sea ice, aiming to reverse glacial melt.

Due to its sustainable design, the Corolla Light Resort has seen far less seawater intrusion and damage to properties compared to other Outer Banks resorts, plus much healthier dune structures. With 450 privately owned and managed homes, over half of which are dedicated to vacationon rentals, coordinated limited development has led to some of the tallest dunes on the island and minimal erosion.

Communities in the Sundarbans have adopted shrimp farming as a sustainable livelihood strategy; the approach has proven successful, with environmental benefits and many farmers earning a good income.

The startup CarbonRun developed a machine that adds limestone to rivers to increase the amount of carbon dioxide they trap. Adding the alkaline substance to the water as a powder converts carbon dioxide into a stable molecule, which keeps it underwater.

A social enterprise that started in the Netherlands and is spreading to countries around the Celtic Sea is training young people to work in marine industries while restoring ocean biodiversity. The young trainees work on projects like marine mammal observation and planting seagrass.

The Athens-based nonprofit Shell to Shore collects oyster shells from restaurants in Georgia to recycle into manmade reefs that will mitigate erosion and flooding.

Marine carbon capture, a term for various methods that trap carbon deep in the ocean, can help mitigate climate change by reducing the amount of the greenhouse gas in the atmosphere. Startups around the U.S. are advancing helpful technologies.