There are a large amount of enviromental adaptations in many human populations, a lot of them to do with enzimatic adaptations. Climate as a term in this context is only usefull if you include, everything, diet, the ability to pass certain contaminents, such as high arsinic concentrations in water, vs binding say calcium. The full list, is, well, everything!, horribly complex, the nose ,perhaps working as a proxy indicator for a number of less visible adaptations, as succes in more extream environments is absolutly dependent on multiple adaptations, none of which is optional over generational time spans, as extream conditions, in an already extream environment, are going to eliminate marginal indivduals.