What does the professor mainly discuss？A．A common weather pattern in the southern Great Pl

What does the professor mainly discuss？

A．A common weather pattern in the southern Great Plains region

B．Factors that created an ecological and human disaster

C．Farming techniques introduced during the Dust Bowl era

D．The erosion of grasslands by excessive rainfall

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！