The correct answer is - Dublin is warmed by ocean currents.
Dublin is warmed by ocean currents, more specifically the Golf Ocean Current which is a warm and wet ocean current, so it makes the climate in Ireland, and also Britain, and Norway much warmer than it is supposed to be according to their respective latitudes. On the other hand, San Francisco is influenced by cold sea currents that come both from the north and the south and make it's temperature lower than what is expected at this latitude.
A surface weather map analyzes weather over a geographical area.
The reason why there are fewer christians in northern Africa is because the culture in Africa is different from christianity.
NOT
the election of a democratic leader in the Arab state of Tunisia.
MAYBE
the adoption of a democratic-leaning constitution in Libya.
