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Coca grows in semitropical areas at heights of between 200 and 1,500 metres over sea level, and unlike oranges, can be harvested three to six times per year.

Seasonal flooding hits large parts of China every summer, particularly in the semitropical south, while some northern regions this year have reported the worst floods in 50 years.

Seasonal flooding hits large parts of China every summer, particularly in the semitropical south.

Every year, seasonal flooding hits large parts of China, particularly in the semitropical south.

They gathered in the chilly northeastern city of Dalian, in semitropical Guangzhou nearly 1,500 miles away and in Wuhan in central China, where the Covid pandemic began at the end of 2019.