if nothing is done each generation of locusts multiplies by 20. so the race is on to stop them breathing again. —— breeding. the bbc‘s senior africa corresponded andi the bbc‘s senior africa corresponded and i have spent the past few months stuck in nairobi covering the impact of the covid—i9 pandemic. is that 0k? yes. thank you very much. today i'm leaving the city to find out about another crisis which has the potential to be even more