There is a north pole, an equator, and a south pole. The reason is that the sun's rays strike at the equator at right angles, and at the poles at oblique angles. Now it is possible that the temperatures at the poles and at the equator were identical before Adam's Fall and that all over the earth the climate was perfect, but that necessarily entails the idea that at that time the earth was not shaped as a ball, and that the sun's rays hit the earth everywhere at the same angle. The two specific questions which have been asked can be reformulated in general terms. Natural law is a term inclusive of climate.
Praxeological law is a term inclusive of everything pertaining to human action, including self-love.
Without hesitation we hold that Adam's sin altered neither natural laws nor praxeological laws in any respect. There was not a single law changed by the Fall, but human conduct was changed. It was the deviation from law that constituted sin. Law, of whatever character, having been fixed by creation, is unalterable. We speak of natural laws and give the term meaning by referring to gravity, electrical phenomena, biological phenomena, etc.