If we notice the wallpaper when things are good, then we shall notice other things, too. When the weather is good, we pay attention to all manner of things in the landscape that we often overlook.
Perhaps we are suited to ideal climates, not because we have evolved into routine symbiotic relationships with them, but because they heighten our senses and continually attract us with new qualia. A copacetic ecosystem can tempt us out of the comfortable known.
Nature knows her resources are limited; this is her way of making us adapt to crisis ahead of time.