Bill Nye on Climate Change: We Could Engineer Low-Methane Cows — or Eat Less Meat| Big Think

Erin: Hey Bill. I’m Erin and I’m from Scotland. I went vegan after I watched documentaries like Before the Flood and Cowspiracy. It presented me with lots of terrifying information such as that from the FAO, which suggests that 14.5 to 18 percent of the world’s global emissions are due to animal agriculture. However, Worldwatch suggests it’s closer to 51 percent. I was wondering if you knew why there was such a difference between these two figures and whether you think that adopting a vegan diet is the best thing we can do as individuals for the planet.

Bill Nye: Erin, you raised a very good point. I don’t know why the two figures in those two studies, the documentary and the—was it a scientific paper?—are discrepant, but it probably has to do with trying to assay or figure out how much greenhouse gas is created by cattle or other livestock. And the problem, everybody, is that livestock eat plants; then bacteria in their livestock stomachs metabolize the plant material into methane, natural gas. And you can make all the jokes you want, but methane is a very strong greenhouse gas.

The first place I’d look to find the reasons for the discrepancy between the two figures is in the amount of greenhouse gas supposed to come from a cow or a sheep or goat. So with humans, the human population getting so big that we are raising so many farm animals, it’s very reasonable that we’re creating a tremendous amount of extra methane that wouldn’t otherwise be there in the atmosphere. And that is causing global warming and climate change to happen more rapidly than would otherwise.

However, if humans weren’t there, animals would be all over the place anyway; it’s not clear that they’d be in these concentrations though. It could be a difficult thing to measure, but it’s also reasonable that agriculture researchers are going to produce or breed farm animals that produce less methane by changing the bacteria that are in their stomachs that metabolize plant matter. To get all the way down to a plant-based diet might be tricky for a lot of people.

However, it seems like a good idea. Check in with me in a few months, because I noticed that my diet is becoming increasingly vegetarian, and so in the next little while, I may be all the way over. “Why aren’t you now Bill?” That’s a great question. I’m working it—I’m working on it. It’s a very interesting question and an important one. And literally a huge one because we’re talking about the Earth’s atmosphere. Thank you Erin.