Researchers can’t tell you if coffee, salt, or alcohol are good or bad for you, but a climate scientist can tell you the exact date on which the world is going to end, despite not even having the ability to do comparative experiments or even much useful observational analysis.A climate scientist can tell you the exact temperature on a date in 1066 AD and draw a hockey stick showing the apocalypse occurring at 12:01 A.M. on February 2nd, 2032, but a scientist studying Vitamin C intake can’t tell you whether it can really make a cold go away a day...