Agricultural trade across US states can mitigate economic impacts of climate change


A new study from the University of Illinois looks at how changes in weather – including extreme events – may decrease crop profit in one state while increasing profits in other states. The secret ingredient: U.S. interstate trade. It is expected to mitigate the economic impact of climate change by up to $14.5 billion by the middle of the century.

“Our motivation for the study is twofold: Climate change brings about more frequent and intense extreme weather events, which impact agricultural production. At the same time, U.S. and global populations are growing. We need to plan for an additional 64 million people in the U.S. and 1.9 billion people worldwide by 2050, which raises concerns for future food security,” says Sandy Dall’Erba, professor in the Department of Agricultural and Consumer Economics (ACE) and director of the Regional Economics Applications Laboratory (REAL) at U of I. Dall’Erba is lead author on the study, published in the American Journal of Agricultural Economics.

Researchers typically have a dire view of extreme weather effects on agricultural production. For instance, the 2012 drought in the Midwest reduced corn production by 20% in Iowa, 34% in Illinois, and 16% in Nebraska compared to the previous year. This had a disastrous impact on crop producer profits in these states.

“However, crop producers in states that did not experience drought at all or to a much smaller extent, like Minnesota, saw record profits,” Dall’Erba notes. “This is because the price of crops went up that year, and the food supply chain, from livestock in Louisiana and Texas to food processing plants throughout the country, needed the raw products to carry on with their activities. As a result, drought events outside of your own state can benefit you.”

Dall’Erba and study co-authors Zhangliang Chen and Noé Nava, graduate students in ACE, conducted their research within the U.S. because the country is so large that a particular weather event is unlikely to affect every state simultaneously.

“Furthermore, U.S. interstate trade has been relatively understudied – in part because data were not available until recently – even though we use around 90% of agricultural products domestically, for livestock and food processing,” Dall’Erba says.

The researchers analyzed trade flows between U.S. states, based on data from the U.S. Economic Census Bureau’s commodity flow survey at four time points: 1997, 2002, 2007 and 2012. They focused on crop and vegetable trade because these commodities, unlike livestock and food processing, are directly affected by weather events.

> Source: EurekAlert!