Guardian: To the European eye, accustomed to square hedgerows and neatly tilled arable land, the countryside of eastern Paraguay is unexceptional, almost pretty. The rolling hills spread out to the far distance. The sky is vast, the horizon broken only by the occasional homestead, leafy copse or bulky metal silo. But to 47-year-old Melitón Ramírez, this is no paradise. It’s a wasteland. Juddering down a farm track in a muddy Jeep, he points to a wide field by the road. It has been sown …