Impact of climate change on agriculture may be underestimated

For example, farmers may react to decreasing yields by putting less land area into production because it is simply not profitable. Farmers may also vary the number of crops they plant in a growing season. Double cropping — the planting of two successive crops in the same field in the same growing season — is common in Mato Grosso. If the weather is bad, farmers may alter their decision to plant a second crop. 

For this new study, the researchers looked not only at crop yield, but also at year-to-year variation in crop area and double cropping. To develop those additional datasets, Cohn and VanWey worked with Jack Mustard, professor of earth, environmental and planetary sciences at Brown, and graduate student Stephanie Spera. Mustard and Spera gathered imagery of the Mato Grosso region from NASA’s MODIS satellite, which monitors land cover and land use all over the world.

In the satellite data, cropland is identified as areas that turn green during the growing season, and then quickly become brown, indicating a harvest. Two green-ups in the same growing season indicate the land is being double-cropped.

“The changes in cropping that we quantified with remotely sensed data were stunning,” Mustard said. “We can use those satellite data to better understand what’s happening from a climate, economic, and sociological standpoint.”

The study showed that temperature increases of 1 degree Celsius were associated with substantial decreases in both total crop area and double cropping. In fact, those decreases accounted for 70 percent of the overall loss in production found in the study. Only the remaining 30 percent was attributable to crop yield.

“Had we looked at yield alone, as most studies do, we would have missed the production losses associated with these other variables,” VanWey said.

Taken together, the results suggest that traditional studies “may be underestimating the magnitude of the link between climate and agricultural production,” Cohn said.

That’s especially true in places like Brazil, where agricultural subsidies are scarce compared with places like the U.S.

“This is an agricultural frontier in the tropics in a middle-income country,” VanWey said. “This is where the vast majority of agricultural development is going to happen in the next 30 to 50 years. So understanding how people respond in this kind of environment is going to be really important.”

VanWey said a next step for this line of research might be to repeat it in the U.S. to see if increased subsidies or insurance help to guard against these kinds of shocks. If so, it might inform policy decisions in emerging agricultural regions like Mato Grosso.

“We may need to figure out a way to create incentives — credit products or insurance — that can reduce farmers’ responses to climate shocks,” VanWey said.

— Read more in Avery S. Cohn et al., “Cropping frequency and area response to climate variability can exceed yield response,” Nature Climate Change (7 March 2016) (DOI: 10.1038/nclimate2934