Swarms of desert locusts that began appearing over the past few months in parts of Mali are threatening to spread northward into Algeria, Libya, Morocco and Mauritania. The swarms are believed to have initially emerged last year in the Libyan conflict zone, fed by abundant rainfall and unusually lush and moist conditions during the past summer.
The insects can consume more than their own weight in vegetation each day, and can ravage crops and pastures within hours.
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The week's hottest temperature was 111.7 degrees Fahrenheit (44.2 degrees Celsius) at Tarcoola, South Australia.
The week's coldest temperature was minus 69.3 degrees Fahrenheit (minus 56.3 degrees Celsius) at Russia's Vostok Antarctic research station.
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