A new study says researchers could be missing important climate and environmental changes associated with reduced livestock grazing.By Jake BolsterIf you stood in front of a map of the world, subtracted its oceans and threw a dart, you would have about a one-in-four chance of hitting land humans use for grazing livestock. But concentrations of grazing animals used for human consumption across the world have been shifting for the last 25 years, according to a new study, suggesting profound environmental and climate consequences.