I think that's basically true, but in a positive way. If you listen to Elaine Ingham, you think of soil.
Geoff Lawton-Hot, dry, tropical climates-greening the desert.
Alan Savory-how livestock can save the dry areas.
Jack Spirko-prepper/survivalist. I think
Toby Hemenway is probably also considered a generalist, but leans toward urban, and historical/anthropological sources, while Paul is definitely leaning toward rural, earthmoving, big acreage, and livestock. Another thing I just thought of. Paul is always funny and entertaining, while the others aren't that way necessarily.
John S
PDX OR