Podcast’s Essential Bites:
[3:58] MG: "Eating insects would be a terrific way to get a lot of protein in a pretty efficient manner, because insects do grow fast and they don't require a lot of feeding to increase their body weight. But I do think a lot of people think they're gross. I think they're more likely to end up as animal feed and particularly fish feed for aquaculture. [...] Right now it's a very tiny part of a global protein intake. [...] It could be a $300 million industry in the United States by 2030, which is really pretty tiny in a trillion dollar global meat market. But as feed, particularly for fish, I think it has some promise."
[11:16] MG: "[UC] Davis [is] doing some studies, and they are feeding seaweed to dairy cows [and] to steers. [...] It's a tiny amount of seaweed that they mix into their feed, [...] but the results were amazing. When I was out there, they were finding 80% less methane emissions from these particular steers that did have a little bit of seaweed in the diet. [...] Getting the seaweed is going to be somewhat of a challenge. It's a very specific type of seaweed that's currently found in Australia. [...] But I do think there is a lot of potential for feed additives to reduce these methane emissions. [...] The inflation Reduction Act that President Biden just signed, does, in fact, have a little mention of promoting these feed additives. So hopefully, seaweed will be available soon."
[22:14] TH: "For wild caught fish, the biggest contributor to climate is the diesel that you burn on the boat. In aquaculture, the biggest contributor to climate is the feed. [...] If you're trying to make the decision, it totally depends on what fish farm and what wild fish you're talking about. [...] Canned [fish] in some ways is always a better choice than fresh in one way and that is that the less perishable the product is, the less food waste you're likely to get. [...] Tuna [...] is in the same sort of greenhouse gas range as chicken. Sardines are way better than tuna."
[35:15] TH: "Unlike almost everything we grow, oysters can be a positive out in the ecosystem. In fact, here on Cape Cod, where we have nutrient loading problems in our estuaries, oyster farming is a codified part of the solution. Because oysters take algae and eat it and they take nutrients out of the water by doing that, they clear the water. [...] One adult oyster can filter like 50 gallons of water in a day. So that can make a huge difference to water quality."
[44:25] TH: "Soy [...] is the most efficient way to grow plant protein. Corn and soy have gotten such a bad rap, because of the way that we grow them in the United States in a monoculture or usually in rotation. And because we put them in cars and pigs and Twinkies, we don't eat tortillas and edamame. But there's a reason that soy and corn came to dominate the landscape and it's not because of subsidies. [...] Calories per acre is the way that we can compare any crop to any other crop. And soy compared to other crops that grow protein is three times better. Here in the United States, we can grow about 6 million calories per acre [of soy]. And that's less than half of what corn can do."