• E237: Agriculture impacts climate change more than you think

  • May 24 2024
  • Duración: 25 m
  • Podcast

E237: Agriculture impacts climate change more than you think Por arte de portada

E237: Agriculture impacts climate change more than you think

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  • Is it possible to decarbonize agriculture and make the food system more resilient to climate change? Today, I'm speaking with agricultural policy expert Peter Lehner about his climate neutral agriculture ideas and the science, law and policy needed to achieve these ambitious goals. Lehner is an environmental lawyer at Earthjustice and directs the organization's Sustainable Food and Farming Program. Transcript How does agriculture impact the climate? And I guess as important as that question is why don't more people know about this? It's unfortunate that more people don't know about it because Congress and other policy makers only really respond to public pressure. And there isn't enough public pressure now to address agriculture's contribution to climate change. Where does it come from? Most people think about climate change as a result of burning fossil fuels, coal and oil, and the release of carbon dioxide. And there's some of that in agriculture. Think about tractors and ventilation fans and electricity used for pumps for irrigation. But most of agriculture's contribution to climate change comes from other processes that are not in the fossil fuel or the power sector. Where are those? The first is nitrous oxide. Nitrous oxide is a greenhouse gas about 300 times more potent than carbon dioxide. And it comes because most farmers around the world and in the U.S. put about twice as much nitrogen fertilizer on their crops, on the land, as the plants can absorb. That extra nitrogen goes somewhere. Some of it goes off into the water. I'm sure your listeners have heard about harmful algae outbreaks or eutrophication of areas like the Chesapeake Bay and other bays where you just get too many nutrients and too much algae and very sick ecosystem. A lot of that nitrogen, though, also goes into the atmosphere as nitrous oxide. About 80% of nitrous oxide emissions in the U.S. come from agriculture. Excess fertilization of our hundreds of millions of acres of crop land. Quick question. Why would, because the farmers have to pay money for this, why do they apply twice as much as the plants can absorb? Great question. It's because of several different factors. Partly it is essentially technical or mechanical. A farmer may want to have the fertilizer on the land right at the spring when the crops are growing but the land may be a little muddy then. So they may have put it on in the fall, which is unfortunate because in the United States, in our temperate area, no plants are taking up fertilizers in the fall. Also, a plant is like you or me. They want to eat continually but a farmer may not want to apply fertilizer continuous. Every time you apply it, it takes tractor time and effort and it is more difficult. So they'll put a ton of fertilizer on at one point and then hope it lasts for a while, knowing that some of it will run off, but hopeful that some will remain to satisfy the plant. There's a lot of effort now to try to improve fertilizer application. To make sure it's applied in ways just the right amount at the right time. And perhaps with these what's called extended release fertilizers where you put it on and it will continue to release the nutrients to the plant over the next couple of weeks and not run off. But we have a long way to go. Okay, thanks. I appreciate that discussion and I'm sorry I diverted you from the track you were on talking about the overall impact of agriculture on the climate. I think what's so exciting about this area is that everyone cares about our food. We eat it three times a day or more and yet we know very little about where it comes from and its impacts on the world around us. It's wonderful to be talking about this. The second major source of climate change impact in agriculture is methane. Methane is another greenhouse gas much more powerful than carbon dioxide. About 30 times more powerful over a hundred years and about 85 times more powerful than carbon dioxide over 20 years. Which is I think the policy relevant time period that we're looking at because we're all trying to achieve climate stability by 2050. And where does methane come from? A little bit comes from rice, but the vast majority of it comes from cows and from manure. Cows are different than you and me. They can eat grass, and their stomachs are different, and release methane. Every time they breathe out, they are essentially breathing out this potent greenhouse gas methane. This is called enteric methane and it's the largest single source of methane in the United States. Bigger than the gas industry or the oil industry. The other major source of methane is manure. Our animals are raised in what are called concentrated animal feeding operations. They're not grazing bucolically on the pasture, they are crammed into buildings where there may be thousands, or tens of thousands, or even hundreds of thousands of these animals. Those hundreds of thousands of animals produce a vast amount of manure, whether it be say pigs...
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