Rising temperatures affecting world’s critical food crops

A new study published in Nature Food by researchers from Aalto University has highlighted the critical threat that rising global temperatures pose to the world’s food crop production. Emphasizing the geographical and crop-specific impacts of climate change, the research offers a granular view of the future challenges in global agriculture.

The study examines the future changes in temperature, precipitation, and aridity and their impacts on 30 major food crop species worldwide. Findings indicate that low-latitude regions are particularly vulnerable, with up to half of their crop production at risk if current climate trends continue. This is in stark contrast to mid- and high-latitude areas, which might see a shift in the types of crops that can be grown, potentially even benefiting from increased crop diversity.

Sara Heikonen, the doctoral researcher leading the study, explained the significant consequences of reduced crop diversity, which could lead to a decrease in the range of food crops available for cultivation, undermining food security and complicating efforts to meet nutritional needs.

Staple crops like rice, maize, wheat, potato, and soybean are particularly at risk, collectively accounting for more than two-thirds of global food energy intake. Tropical root crops, crucial for food security in lower-income regions, along with cereals and pulses, are also highly susceptible, especially in sub-Saharan Africa, where nearly three-quarters of current production could be compromised if temperatures rise beyond 3°C.

The study also discusses adaptation and mitigation strategies. Professor Matti Kummu, the senior author, highlights the dual challenge of climatic potential versus practical implementation. He notes that while mid- and high-latitude regions might adapt by changing the crops they cultivate, low-latitude areas need substantial support to enhance yields through better access to resources like fertilizers and irrigation and by minimizing food losses in the production and storage phases.