Photo by Pedro Szekely.

Not that I was under any illusions that Death Valley, Calif., is a temperate place to live, but this is nuts: The overnight LOW on July 11-12 was 107 degrees F. That ties for highest-recorded daily minimum. (The previous 107-degree night was last year, in Oman.)

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The high in Death Valley on the 11th was 128 degrees F, the 10th highest temperature ever recorded. But steadily warming minimum temperatures may be even more of a concern than record highs. It’s hot nights that kill people, not hot days. And rice, a staple crop for much of the world, needs cool nighttime temperatures to grow — meaning that warming nights are an even greater threat to food security than warming in general. Also, it makes life really really hard for Batman.

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