California faces highest shark numbers in years as great whites head north

El Niño climate phenomenon heating waters off Mexico but incidents with humans remain a rarityCalifornia is set to see one of its sharkiest summers in a decade, with large numbers of juvenile great whites already on a reverse vacation from the warm waters of Mexico to cooler pastures along the western United States.The marine predator has become more common along the west coast in recent years, with stories of surfers seeing underwater behemoths closer to shore and scientists saying swimmers an...