The student used correlation not causation. There is a high correlation with gray haired residents and Florida. But the cause of graying hair is not living in Florida. It might be something totally different. It might be a coincidence that it so happens to be in Florida. The student needs more evidence to make such a leap in logic.

Fog forms when the difference between air temperature and dew point is less than 2.5 °C (4.5 °F). Fog begins to form when water vapor condenses into tiny liquid water droplets suspended in the air. ... This occurs from either added moisture in the air, or falling ambient air temperature.
Congress
Wade-Davis Bill, claimed that Congress - not the president - should control Reconstruction; and stated that a majority needed to take loyalty oaths; Lincoln used a pocket veto to kill the legislation.
They believe it causes global warming, that is the increase in average global temperatures, which in turn would lead to <span>an increase in melting polar ice caps, rise of sea levels and rendering some places uninhabitable (some places on Earth would be too hot to live in).</span>