Inter Press Service: An estimated 400 million acres of farmland in the United States will likely change hands over the coming two decades as older farmers retire, even as new evidence indicates this land is being strongly pursued by private equity investors. Mirroring a trend being experienced across the globe, this strengthening focus on agriculture-related investment by the private sector is already leading to a spike in U.S. farmland prices. Coupled with relatively weak federal policies, these rising prices are barring…