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Breathing, that's when we are getting that methane read. >> so are these stoney field cows? or what's -- what's the relationship? >> the milk from these cows comes straight to stoney field and right to our yogurt. >> always sort of at the forefront of conservation and sustainability. as i am making this hour, i am meeting a lot of people who think this is no such thing as sustainable dairy. what do you say to that? >> well, first of all, look around, right? these cows are doing a service that we couldn't be doing with vegetables. they are taking sunlight and grass, and turning that into nutrit...

To study coral reefs. but that got really depressing. then, she thought, what if seaweed farms could help heal underwater life, the way trees do on land? and draw down carbon. and create new jobs. and make less-gassy cows and better meat and milk. >> the solution can't only be about suppressing methane. it's, also, got to be something that will increase milk productions or -- and yields -- or the quality. the butterfat content, for instance, in order for it to be a really viable solution. >> the been end of this study is happening at a place called wolf's neck. pretty much, the exact opposite ...

To measure how much greenhouse gas goes down and how much goes up. in europe, they're experimenting with methane-catching cow masks. tough to provide for over a billion cows. but one of the ideas strauss is most excited about would cut the amount of methane burping out of his herd, by feeding them seaweed. >> cows eat 45 pounds, per day. so, you feed one-to-three ounces of this material, of this red seaweed, and you can get 80 to 90% reduction in the methane production. >> reporter: one hitch. this red seaweed only grows in the pacific. but what if the rest of the world's kelp could do the sam...

Feed cows and has a bad corn year, is screwed in the same -- in the water. >> it's no different. i think the big difference is how adaptable this industry is. >> yeah. >> we have this tremendous opportunity here, on the coast. where fishermen can diversify in ways that most terrestrial farmers never could. >> reporter: since they already have the gear and knowledge, she convinced lobstermen that farming kelp in the winter is a win/win. >> it's great for the water quality. neutralizes our carbon footprint. and -- and sell it, make a little bit of money, and people get to eat it. >> reporter: bu...