Keith Cressman is senior locust forecaster at the U.N. Food and Agriculture Organization.
Opinion
World must protect India and Pakistan from threat of locust swarms
Insects wipe out crops and pastures, damaging food supply and livelihoods
A man attempts to fend-off a swarm of desert locusts in Kenya on Feb. 21: it is the worst outbreak to strike the country in 70 years. © Reuters
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