The corollary to all this is that once man has begun to "conquor" a given geographical area and cope with its environment to the point that it is no longer a threat to his existence, then landscape painting either becomes nostalgic, or declines noticably in importance, giving way to other more important subjects such as expressionism, introspection, social commentary, art for art's sake (as in abstraction), or simply "pretty pictures"
An interesting example of this can be seen in the fact that in areas such as Canada and Southwestern United States, where the land is still very much wild and the weather even wilder, there remains a strong, contemporary, affinity for landscape painting. Contrast this with the east coast of the U.S., where only the relentless (and often threatening) sea holds any interest for the "landscape" artist. Or look at the work coming out of urban areas where the landscape as a subject for art is looked upon as being somehow "quaint"; where artists only paint to impress one another, their struggle being not with the landscape around them but with that landscape which is WITHIN themselves.