In 1988, the UN and NASA said they were 99% certain that the midwest drought was caused by the greenhouse effect.

8 Jul 1988, Page 1 – Tyrone Daily Herald at Newspapers.com

The 1988 drought was the last severe midwest drought.

Climate at a Glance | National Centers for Environmental Information (NCEI)

As always, the UN and NASA have no clue what they are talking about.