Reuters: The Conservation Reserve, which pays owners to idle fragile U.S. farmland, could become one of the largest carbon sequestration programs on private land, an Agriculture Department official said on Wednesday. Some farm-state lawmakers say efforts to reduce greenhouse gases could result in a pay-off in rural America because some agricultural practices, such as reduced tillage, can lock carbon into the soil. USDA official Robert Stephenson pointed during a U.S. House of …