WASHINGTON — A new, but controversial study asks if an end is coming to the busy Atlantic hurricane seasons of recent decades. The Atlantic looks like it is entering in to a new, quieter cycle of storm activity, like in the 1970s and 1980s, two prominent hurricane researchers wrote Monday in the journal Nature Geoscience. Scientists at Colorado State University, including the professor who pioneered hurricane seasonal prognostication, say they are seeing a localized cooling and salinity level drop in the North Atlantic near Greenland.