INJECTING particles into the atmosphere to cool the planet and counter the warming effects of cli­mate change would do nothing to offset the crop damage from rising global temperatures, according to a new analysis by University of Cali­fornia, Berkeley, researchers.

By analysing the past effects of Earth-cooling volcanic erup­tions, and the response of crops to changes in sunlight, the team concluded that any improvements in yield from cooler temperatures would be negated by lower produc­tivity due to reduced sunlight.

The findings have important implications for our understanding of solar geoengineering, one pro­posed method for helping humanity manage the impacts of global warming.

“Shading the planet keeps things cooler, which helps crops grow better.

But plants also need sunlight to grow, so blocking sunlight can affect growth. For agriculture, the unintended impacts of solar geo­engineering are equal in magnitude to the benefits,” said lead author Jonathan Proctor, a UC Berkeley doctoral candidate in the Depart­ment of Agricultural and Resource Economics.

“It’s a bit like performing an experimental surgery; the side-effects of treatment appear to be as bad as the illness.”

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