
By Lauren Wolahan
For the first time ever, the UN is building out a roadmap for curbing carbon pollution from agriculture. To take part in that process, a coalition of U.S. farmers traveled to the UN climate conference in Madrid, Spain this month to make the case for the role that large-scale farming operations, long criticized for their outsized emissions, can play in addressing climate change.
Often, conversations about agriculture feature calls for more small-scale, organic farming, the abolition of animal agriculture, and a shift away from farming row crops like corn and soy. The farmers at the meeting in Madrid, many of them political conservatives, aimed to challenge this view.
A.G. Kawamura, a third-generation fruit and vegetable grower and California's former secretary of food and agriculture, responds to critics by asking, "Well, did you eat today?"
The debate about the environmental impact of agriculture harkens back to the 1950s, which gave rise to synthetic pesticides and fertilizer, genetically modified crops, and advanced machinery. These tools allowed farmers to produce more food than ever before, but they also did considerable damage.
The widespread use of pesticides and fertilizers killed insects and birds, as well as fish who lived downstream of farms. The focus on cash crops led many farmers to plant the same crop year after year, sapping the soil of needed nutrients. And the embrace of high-powered farming tools turned once-rich topsoil into lifeless dust.
In light of these facts, many in the environmental community have called for a radical overhaul of the agricultural system. Longtime farmers of row crops like corn and soy are pushing back. They say that, through smart farming practices, they can actually help curb pollution.
Many farmers, for instance, are using advanced technologies that help them to cut down on pollution by allowing them to apply chemicals only where they're needed. But these technologies are only cost-effective on larger farms.
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Growers said they can mitigate the impact of large-scale farming by embracing practices such as no-till farming, which uses machines that don't tear up the earth, and so doesn't release the carbon stored in the soil. They have also called for planting cover crops — like oats, radishes and cereal rye — in between rows of corn or hay to cover any bare earth, keeping carbon trapped in the ground.
In addition to stemming pollution, these practices also help the soil hold more moisture, meaning it can absorb extra water during a heavy rainstorm, keeping farms healthy. In an industry increasingly threatened by extreme weather, this is good business, said Fred Yoder, an Ohio farmer and former head of the National Corn Growers Association. He said he thinks of his soil as a 401k, a long-term investment that will help him weather future difficulties.
Yoder and other growers want the UN to encourage member countries to incentivize climate-friendly farming practices. Cover crops, for example, are currently used on just 4 percent of Iowa farmland. Widespread adoption of cover crops could be key to curbing farming-related emissions.
Critics, however, say that even with smarter practices, large-scale farms will continue to be a significant source of pollution.
"Farming is more than just a collection of practices. It is a system within the local ecology," said Ben Lilliston of the Institute for Agriculture and Trade Policy. He said that carbon-smart farming can help curb pollution, but he believes that, ultimately, growers need to build farms that are more integrated with nature.
Many growers in Madrid, however, contended that large-scale farms could operate in harmony with nature, and they were eager to defend their environmental bona fides.
"The American farmer is the original environmentalist," said Ray Gaesser in a panel on agriculture and climate change. Gaesser has been farming soybeans in Iowa for 50 years and previously chaired the American Soybean Association. "Yes, I happen to be conservative," he added, "but that doesn't mean I am not seeing the impacts of our changing planet first hand."
Gaesser recalled a time 20 years ago when he watched, astonished, as four inches of rain fell on his farm in less than an hour. The deluge washed away much of his topsoil. Since then, he's seen such rainstorms like that one strike at least once a year.
Another way that farmers can combat climate change, panelists said, is by embracing renewable energy. In corn-rich Iowa, for instance, the landscape is dotted with wind turbines and barns with solar panels on their roofs. The revenue from clean energy on farmland helps insulate growers against increasingly volatile commodity prices as well as the severe weather that could stunt yields.
"Farmers are used to working with big equipment, and they don't tolerate equipment that doesn't work, and just like everyone else, they love making money. Solar works, and it makes them money," Tim Dwight, President of the Iowa Solar Energy Trade Association, said on the panel. "What's not to love?"
Dwight said that wind and solar have grown in Iowa with the support of the agricultural community, which looms large in the Hawkeye State. His colleagues underscored this point in their argument at the climate talks.
"Farmers have a tremendous opportunity to be part of the climate solution," said Ernie Shea, president of Solutions from the Land, a non-profit advocating for better farming practices to address climate change. "That's why so many of us are here."
Reposted with permission from Nexus Media.
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A Game of Jenga
<p>Think of it as a game of Jenga and the planet's climate system as the tower. For generations, we have been slowly removing blocks. But at some point, we will remove a pivotal block, such as the collapse of one of the major global ocean circulation systems, for example the Atlantic Meridional Overturning Circulation (AMOC), that will cause all or part of the global climate system to fall into a planetary emergency.</p><p>But worse still, it could cause runaway damage: Where the tipping points form a domino-like cascade, where breaching one triggers breaches of others, creating an unstoppable shift to a radically and swiftly changing climate.</p><p>One of the most concerning tipping points is mass methane release. Methane can be found in deep freeze storage within permafrost and at the bottom of the deepest oceans in the form of methane hydrates. But rising sea and air temperatures are beginning to thaw these stores of methane.</p><p>This would release a powerful greenhouse gas into the atmosphere, 30-times more potent than carbon dioxide as a global warming agent. This would drastically increase temperatures and rush us towards the breach of other tipping points.</p><p>This could include the acceleration of ice thaw on all three of the globe's large, land-based ice sheets – Greenland, West Antarctica and the Wilkes Basin in East Antarctica. The potential collapse of the West Antarctic ice sheet is seen as a key tipping point, as its loss could eventually <a href="https://science.sciencemag.org/content/324/5929/901" target="_blank">raise global sea levels by 3.3 meters</a> with important regional variations.</p><p>More than that, we would be on the irreversible path to full land-ice melt, causing sea levels to rise by up to 30 meters, roughly at the rate of two meters per century, or maybe faster. Just look at the raised beaches around the world, at the last high stand of global sea level, at the end of the Pleistocene period around 120,0000 years ago, to see the evidence of such a warm world, which was just 2°C warmer than the present day.</p>Cutting Off Circulation
<p>As well as devastating low-lying and coastal areas around the world, melting polar ice could set off another tipping point: a disablement to the AMOC.</p><p>This circulation system drives a northward flow of warm, salty water on the upper layers of the ocean from the tropics to the northeast Atlantic region, and a southward flow of cold water deep in the ocean.</p><p>The ocean conveyor belt has a major effect on the climate, seasonal cycles and temperature in western and northern Europe. It means the region is warmer than other areas of similar latitude.</p><p>But melting ice from the Greenland ice sheet could threaten the AMOC system. It would dilute the salty sea water in the north Atlantic, making the water lighter and less able or unable to sink. This would slow the engine that drives this ocean circulation.</p><p><a href="https://www.carbonbrief.org/atlantic-conveyor-belt-has-slowed-15-per-cent-since-mid-twentieth-century" target="_blank">Recent research</a> suggests the AMOC has already weakened by around 15% since the middle of the 20th century. If this continues, it could have a major impact on the climate of the northern hemisphere, but particularly Europe. It may even lead to the <a href="https://ore.exeter.ac.uk/repository/handle/10871/39731?show=full" target="_blank" rel="noopener noreferrer">cessation of arable farming</a> in the UK, for instance.</p><p>It may also reduce rainfall over the Amazon basin, impact the monsoon systems in Asia and, by bringing warm waters into the Southern Ocean, further destabilize ice in Antarctica and accelerate global sea level rise.</p>The Atlantic Meridional Overturning Circulation has a major effect on the climate. Praetorius (2018)
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