Now this has me thinking, what could be more organic than using the earths magnetic field to help get better yield. Instead of closing these sites off to the public, what we should really be doing at this point is allowing people to use these sites to electromagnetically modify their seeds, AND we should be finding more of these sites.
Anyways, John Burke's discovery could be one of the biggest agricultural discoveries of the century, and quite possibly could start a whole new agricultural revolution. Although, unfortunately, instead of opening these sites up to the public to be used this way, most people will resort to artificial means to the same end (which has been done, in small) because governments around the world think it is more important that these sites be preserved instead of used for good (and because John wants to make some money, I can't blame him).
If you have one of these stone circles or dirt mounds near you and it isn't closed off to the public, I would recommend giving this a try. If nothing else, at least you'll get to see the sun rise at an ancient monument

On a side note, many of these sites were found by looking for "Fairy Circles", almost perfect circles of longer, faster grass growth and often mushroom growth within the grass. Last year one of these fairy circles showed up in my backyard, I wonder if I have one of these amplified spots right in my own yard O.o .
Edit: I tried searching for indian dirt mounds and all I could find was the same story about one of them being torn down for a sams club parking lot reprinted over and over again. Does anyone know of any resource for finding these sites in the United States?