This podcast is brought to you in part by PNAS Science Sessions, a production of the proceedings

of the National Academy of Sciences. Science Sessions offers brief yet insightful discussions

with some of the world's top researchers. Just in time for the spooky season of Halloween,

we invite you to explore the extraordinary hunting abilities of spiders featuring impressive

aerial maneuvers and webs that function as sensory antennas, follow science sessions,

on popular podcast platforms like iTunes, Spotify, or your preferred podcast platform.

A fast growing front in the battle against climate change is focused on developing green

technologies aimed at reducing humankind's carbon footprint. But many scientists say

simply reducing emissions is no longer enough. We have to find new ways to suck carbon out of

the atmosphere. A main startup is looking to raise a sinkable carbon-capturing forest in the

open ocean. I'm Theresa Carey, and this is Scientific Americans' 60-second science.

Adam Bass strolls through a warehouse on the coast of Harbswell, Maine.

Surrounding him are trays of oysters with water circulating between them in small tubes.

In another room, stands rows of eight-foot tall tanks of algae,

growing at different stages. The algae will be food for the oysters.

If you've never seen a shellfish hatchery, this one looks pretty typical, but it's not.

This year, they're planning to harvest something new, atmospheric carbon.

His company, called Running Tide Technologies, plans to grow vast quantities of seaweed

in drifting ocean mini-farms. Farms that the company plans to sink to the bottom of the ocean.

So this is basically taking the emissions of our fossil fuel burning,

locking them back up into the structure of the kelp and sending it back to the bottom of the ocean

where it's at least locked up for hundreds to thousands of years because of the great pressure

...