What was the one reason for the increase in births between 1946-1964?
The reason for the increase in temperature of the atmosphere is the increase in greenhouse gas levels in the air. When we burn any kind of fossil fuels (coal, oil and natural gas) we release carbon dioxide that has been hidden away for 300 million years. This increase is holding more heat in the atmosphere.
For most metal conductors, the answer is yes... indirectly. An increase in voltage causes an increase in current which, in turn, causes an increase in temperature. An increase in temperature causes an increase in resistivity, which causes an increase in resistance. This is the reason that Ohm's Law doesn't apply to most conductors!