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Texans, hold onto your hats: it’s going to be a bumpy ride.

According to of Purdue University in West Lafayette, Indiana, and colleagues the weather in southern California, western Texas and northern Mexico is going to become increasingly unpredictable whatever we do. This is true in both a best-case scenario in which new technology curbs future emissions, and if the worst happens and population growth fuels a doubling in carbon dioxide levels (see maps).

Residents in these areas will see pronounced fluctuations in temperature and rainfall from year…