CO2 levels in the atmosphere were greater in the second half of the twentieth century, the reverse of hurricane frequency. (ddears.com)
Global hurricane frequency is undergoing a long - term decline, with global hurricane and tropical storm activity at record lows during the past several years. (chron.com)
He said scientists need about a century's worth of good data to start making sophisticated predictions about the influence of human - caused climate change on hurricane frequency. (scientificamerican.com)