Humans may have ‘locked in’ drought-inducing climate pattern: Study

Greenhouse gas emissions generated by humans may have “locked in” a climate pattern responsible for long-term megadrought across the U.S. West, a new study has found. Human-induced shifts to the pattern, called the Pacific decadal oscillation (PDO), are directly linked to the persistent aridity plaguing California and the Colorado River basin states, according to the...