Dandelions to replace rubber: How realistic are alternative crops?
Katrina Cornish spends her days raising dandelions and desert shrubs. She harvests the stretchy rubber substances they produce and uses special machines to dip them into condoms, medical gloves and parts for trachea tubes. And she thinks those products could forever alter the landscape of agriculture in the United States.
Cornish, a professor at Ohio State University who studies rubber alternatives, isn’t the only one pouring energy into alternative crops like that desert shrub, guayule, or the rubber dandelions that bloom with yellow petals in the greenhouse where Cornish works. In Arizona, too, guayule thrives amidst drought, its blue-green leaves set apart from dry dirt at a research and development farm operated by the tire company Bridgestone. And in Nebraska and other parts of the central U.S., green grasses of sorghum spring up, waving with reddish clusters of grains.
They’re not the corn, soybeans, wheat or cotton that have dominated those areas for decades. Instead, they’re crops that many companies, philanthropic organizations and national and international entities tout as promising alternatives to fight climate change. But while some researchers and farmers are optimistic about the potential of these crops, many of which are more water-efficient and important in certain parts of the world to fight hunger, they also say drastic changes would need to happen in markets and processing before we ever see fields full of these out-of-the-box plants or many products in stores made with them, especially in the United States.
Most rubber processing happens overseas, and the U.S. isn’t prepared to process rubber domestically. But Cornish also says the threats of disease, climate change and international trade tensions also mean that it would be a smart investment to work on growing and processing domestic alternatives.
With sorghum, too, grown for people to eat as well as for farm animals or even pet food, processing would need to be scaled up, said Nate Blum, chief executive officer of Sorghum United, an international non-governmental organization focused on spreading awareness about sorghum. Though the U.S. is the world’s largest producer of sorghum, it still represents only a small fraction of acres grown compared to commodity crops like corn and soybeans. And though corn and soybeans are heavily incentivized in the U.S., Blum is hopeful that consumer demand will encourage more investment in the sorghum and millets industry.
However, farmers are more likely to plant whatever crops get subsidies, said James Gerber, a senior scientist with climate solutions nonprofit Project Drawdown. Gerber, who recently published a paper in Nature Food about which crops will continue to see yield growth and which may stagnate in the coming years, said comparing sorghum production in India and the U.S. illustrates this principle. India has invested heavily in improving sorghum yields there, but the U.S. has not, he said.
With climate change bearing down on agriculture around the world, the need for crops that can withstand extreme weather like persistent drought is especially important in parts of sub-Saharan Africa and South Asia where smallholder farmers rely on just a few acres of land. Some of the breeding programs for those crops are based in the U.S., but they are much less frequently included in the American diet or lifestyle.
That’s why specialty markets will be critical if these crops have any hope of taking off here, Cornish said. She thinks that, just as Tesla opened up the possibility of mainstream electric cars by first marketing the product as a luxury good, premium goods like condoms, trachea tube parts and radiation-rated surgical gloves need to be made with dandelion and guayule to inspire producers to grow more meaningful amounts of either of those crops.
“You can’t do it without going to that route because you have no economies of scale, and you do not have enough to go into markets that require a large amount,” Cornish said.
Guayule is “clearly a specialty crop and probably always will be” in terms of acres grown, said Bill Niaura, Bridgestone’s executive director of sustainable innovation. He said that Bridgestone’s work on guayule has been strictly in the research and development realm for about the last 10 years, and only within the past two years or so has the company been transitioning it into an exploratory business. “You’re trying to develop a new industry for the Americas that currently doesn’t exist,” he said.
In the meantime, farmers in the U.S. rely on an agricultural economy built on scale, so they farm the crops that allow them options of where to sell, said Curt Covington, senior director of institutional business at AgAmerica Lending, a private investment manager and lender focused on agricultural land. He added that the bankers financing those farmers often don’t want to take the risk on a full switch to a crop that doesn’t have established markets. That, he said, could be a problem for the country as climate change exacerbates threats to crops like cotton and alfalfa, thirsty crops grown in the Southwest, in the future.
Farmers in Arizona have already had to fallow land, stopping their planting altogether and sometimes struggling with or giving up on family businesses as a result of Colorado River water cuts. Though guayule only uses half as much water as cotton and alfalfa, if the economics don’t support it, that doesn’t do the majority of farmers much good.
“Ultimately what you end up with is potential for, honestly, a lot of fallowed land, and that same crop being imported into this country from other countries,” Covington said. “And so to me that creates a security risk for this country.”
That’s something Cornish thinks can be prevented, she says, by reimagining the United States not as a land dominated by waves of grain, but also as a dominant producer of natural rubber.
“My job isn’t done until this is a permanent feature of the landscape,” she said.