Climate change cut global wheat and corn output by more than 3% over the past three decades compared to growth projections without a rise in temperatures, a study found on Friday. The impacts translated into up to 20% higher average commodity prices, before accounting for other factors, according to the paper published in the journal Science.

Crop yields rose over the period as a result of improvements in practices and plant breeding, and the isolated, negative impact of climate change was equivalent to about one tenth of those advances.