moira, I've said this before but I don't say it enough, so JOURNALISTS IN PARTICULAR, LISTEN UP:
If you are writing for Americans about #GlobalWarming and/or #ClimateChange?
USE FAHRENHEIT.
STOP USING C. STOP IT. USE F.
If you say "1.5 degrees celsius" most will hear one of two things:
A: 1.5°F, which they will further reduce to "nothing," because you can't really feel it. "A degree or two" means nothing.
B: ZERO, because they hear "small number I don't understand."
USE. FAHRENHEIT. AT. AMERICANS.
For real. "2 degrees (C)" means "basically nothing" but "4 degrees (F)" is "huh." It's something Americans know they can feel. Americans know the difference between 68F and 72F.
So I beg you:
Stop. Using. C. At. Americans.
Use. Fahrenheit.