You can not have environmental adaption if you do not have a specific environment
Humans are the only animal that can be found all over the world. In every climate zone imaginable. Is it because of our great adaptions to environments? No.
We are very poorly adapted to any specific environment. Set a naked man out in the desert, he dies. Set him out naked in the arctic, he dies. Set him out in the rainforest and something is likely to kill him.
The reason we are found everywhere is that we adapt our environment instead of adapting to it. We have clothes and houses to shield us from immediate weather conditions. We have cleaned most of our environments of predators that could harm us.
That is why we developed technology.
Humanity's greatest adaption is the intelligence and the power to craft tools for any kind of purpose. That is why as a species we are poorly adapted physically, because we use technology to make up for our weaknesses and become better at doing certain things than even some animals who specialise in those things.
If you are asking what to change so they are better adapted to a specific climate and enviroment then you need to state what climate that would be. Otherwise no one could ever list all possibilities.