(1) Fertility rate is low, we need immigration. (2) The world is overpopulated, we need to reduce our numbers. Pick one. Personally, I do not believe either

(1) Fertility rate is low, we need immigration. (2) The world is overpopulated, we need to reduce our numbers. Pick one. Personally, I do not believe either "we need" to be true, but I keep hearing both contradicting viewpoints, which is slightly annoying.