Climate Change Threatens Cereal Crop Yields: Study

By Hendrik Schneider

The effects of climate change pose a major challenge for cereal production in many regions. In a study published in Nature Reviews Earth & Environment, ZALF scientists have investigated how warmer temperatures, increased carbon dioxide levels and changes in water availability affect globally important cereals such as wheat, maize, millet, sorghum and rice.

In the case of a climate change scenario without adaptation measures, the simulated global crop yield losses for cereals are between 7% and 23%. The negative effects of climate change on cereal yields in higher latitudes could potentially be offset or even reversed through carbon dioxide fertilization and adaptation options. However, this would require significant investment and resources, for example in irrigation infrastructure and water availability.

These adaptations could increase wheat yields in higher latitudes by up to 40% compared to the baseline, according to the authors of the study. In lower latitudes, carbon dioxide fertilization is less beneficial. Irrigation and nutrient management are probably the most effective adaptation options.

Millet and sorghum crops are often neglected in other studies in favor of wheat, maize and rice, but are important for food security in parts of Africa. Therefore, more targeted experimental and modeling studies are necessary to gain a clearer understanding of their response to climate change.