Drought May Hit Half World’s Wheat at Once

Wheat yields could be hit by severe drought across half the world at once, driving up prices and making problems for global markets.

The planet’s daily bread could be at risk as the global thermometer creeps up and climates begin to change.  New research has warned that almost two thirds of the world’s wheat-growing areas could face “severe, prolonged, and near-simultaneous droughts” by the century’s end.

Right now 15% of the world’s wheat producing regions are at risk of severe water scarcity at the same time.  Even if the 195 nations that agreed in Paris to stop global average temperatures from rising beyond 1.5°C by 2100 keep that promise, the chance of simultaneous water stress across continents would still double between 2030 and 2070.

But if nations fail to mitigate the climate change and extremes of heat and rainfall that would inevitably follow runaway global heating, then the chances of devastating failure of wheat harvests in both Europe and North America, or both Europe and Australia, or Russia, Ukraine, and Kazakhstan, begin to soar.

Wheat provides one-fifth of all the calories for humankind.  It is the world’s largest rain-fed crop and the global wheat trade matches the traffic in rice and in maize combined.  Ten regions account for 54% of the planet’s wheat fields, and 57% of the world’s wheat.

Scientists from Europe, the US and China report in the journal Science Advances that they worked with computer simulations to model the future global weather for water scarcity with changes in temperature for the next eight decades.

Wheat is a successful crop partly because its water needs are relatively low, but it can’t flourish without reliable rainfall before and during growth.  And the new simulations confirm earlier fears:  that extremes of heat and devastating drought could happen in more than one continent at the same time.

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