evidence: Rising levels of atmospheric CO2 do not necessarily cause global warming. Earth’s climate record shows that warming has preceded, not followed, a rise in CO2. According to a study published in Science, measurements of ice core samples showed that over the last four climactic cycles (past 240,000 years), periods of natural global warming preceded global increases in CO2. [117] The Proceedings of the National Academy of Sciences published a study of the earth’s climate 460-445 million years ago which found that an intense period of glaciation, not warming, occurred when CO2 levels were 5 times higher than they are today. [4] According to ecologist and former Director of Greenpeace International Patrick Moore, PhD, "there is some correlation, but little evidence, to support a direct causal relationship between CO2 and global temperature through the millennia." [60] [...] According to a report from the Tropical Meteorology Project at Colorado State University, the increase in human-produced CO2 over the past century has had "little or no significant effect" on global tropical cyclone activity. The report stated that specific hurricanes, including Sandy, Ivan, Katrina, Rita, Wilma, and Ike, were not a direct consequence of human-caused global warming. [89] Between 1995-2015, increased hurricane activity (including Katrina) was recorded; however, according to the NOAA, this was the result of cyclical tropical cyclone patterns driven primarily by natural ocean currents. [125]