Climate change threatens Amazonian small farmers

Minor climate variation would seem to favor the small farmer, as unlike large-scale farmers, most small farmers plant a wide variety of crops. Variation in rainfall one year might cause low yields of some crops, but may leave the others unaffected. Large-scale farmers are also vulnerable but in different ways. As they tend to plant capital intensive large-scale monocultures, climate change for a given growing season could be innocuous -- or it could be catastrophic.

But small farmers are also limited in what they can do. Not only are Amazonian small farmers less likely than corporate farmers to have access to current weather data and information about a coming drought, they also have less access to equipment that might protect crops from fire during times of unusual dryness or from flood during times of above-normal rainfall.

"Farmers are aware of the climate change discussion," Brondizio said. "But because climate data and forecasts are presented at a regional scale not applicable at the farm level, farmers prefer not to take the risk of changing land use practices."

Emilio Moran added, "They tend to do what they have always done -- but that is a recipe for trouble under conditions of climate change, wherein extreme events will become more common. While some individuals adjust their practices relatively fast, it usually takes a generation to observe changes at the population level."

To avoid the negative human and economic consequences of an even larger exodus of small farmers to the cities, Brondizio says regional and national governments must make an effort to help small farmers cope by producing and disseminating knowledge that is useful to them. He also says small farmers require better provision and access to services commonly available to large-scale farmers. Moran says the number of data-gathering weather stations must be increased.

"What is needed is to maintain roads and to provide appropriate technical assistance, health care, and other services to encourage these farmers to stay in the region," Brondizio said. "As far as climate change is concerned, the lack of extension services is a problem. Small farmers will need people to translate climate information into information they can use to make decisions. We also know there is a need to generate more data about what's going on locally which may help local farmers predict something like drought or their risk of fire."

Funding for the study came principally from the National Oceanic and Atmospheric Administration (NOAA), with additional funding from NASA and the National Institute of Child Health and Human Development. The authors also thank the staff of Brazil's Ministry of Agriculture in the state of Para for their aid and support.

To speak with Brondizio or Moran, please contact David Bricker, University Communications, at 812-8560-9035 or .