@tootall10

Genetic changes happen all the time. Some are subtle and than thousands of years need to pass until any "visible" or "functional" obvious changes happen that can be observed and sometimes they are big and sudden and than big changes happen which can be beneficial OR detrimental to an individual (or species). Most have no effect on survival per se like variances in coloration, shape of eyes, texture of hair etc etc.

All in all, changes in our environment are too big and too fast for us to "evolve" and adept to them so no hope for that. Fortunately for us and unfortunately for the planet we have ability to change our environment or make artificial one for us to survive.

Of course, there will be the point of no return and than we will be gone like dinosaurs one day in very distant future. In 1 billion years the Earth will be totally changed by Sun radiation (regardless of anything that we do) and in 6 billion years the Sun will die and become dead star. Yes ... stars die too : ((((.