> They were warned what would happen.

They also believed in "rain follows the plow."

> windbreaks on farms

Sure, https://en.wikipedia.org/wiki/Great_Plains_Shelterbelt .

But that was only one of many techniques developed. https://archive.org/details/bighughfatherofs0000well/page/11... mentions "if subject to wind erosion, it calls for stubble-mulch farming, wind strips and windbreaks." (That's a biography about Hugh Hammond Bennett, who led the Soil Erosion Service ... but not the Shelterbelt!)

In general (a few paragraphs earlier):

'Modern soil conservation is based on sound land use and the treatment of land with those adaptable, practical measures that keep it permanently productive while in use,” he explains. “It means terracing land that needs terracing; and it means contouring, strip cropping, and stubble-mulching the land as needed, along with supporting practices of crop rotations, cover crops, etc., wherever needed. It means gully control, stabilizing water outlets, building farm ponds, locating farm roads and fences on the contour, and planting steep, erodible lands to grass or trees.“'

Earlier at https://archive.org/details/bighughfatherofs0000well/page/96... you can read about the then-novel idea of contouring;

"Tillage is proceeding across the slopes, rather than up and down hill. It is being done on the contour on 15,362 acres. Farmers are finding that it not only serves as a brake on running water but also reduces the cost of mule-power and tractor-power."

Oh, interesting. In 'Predicting and Controlling Wind Erosion', Lyles (1985) writes "Despite the credit the Prairie States Forestry Project has received in ending the Dust Bowl, windbreak plantings under the Project did not begin on a large scale until 1936", and says "the cardinal principle of wind erosion control is maintaining vegetative materials on the soil. ... this practice of conserving or maintaining vegetation on the surface has evolved into various forms of tillage management, which currently go under the generic name of conservation tillage and have become a major technique for erosion control." (See https://www.jstor.org/stable/pdf/3742385.pdf )

This suggests again that trees and windbreaks in general are not the primary solution to the regions affected by the Dust Bowl, but rather grasses, including crops.