Subject: Environment Context: Food and Agriculture Organization (FAO) has warned India to remain on high alert against locust attack for the next four weeks. Concept: The FAO has three categories of Desert Locust situations: Outbreak: It is common occurence Upsurge: current locust attack (2019-2020) has been categorised as an upsurge. Plague Upsurges and plagues do not occur overnight; […]