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Originally Posted by Wowbagger
Also, if the temperature change on a global scale, it will surely change the natural balance within ecosystems. However, new and different balances will take place. These ecosystem might be different, but their values will not. One ecosystem isn't better than another ecosystem, unless maybe we hold an utilitarian perspective, then global warming will create ecosystems of higher values to us.
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But many human societies have been built around a certain type of ecosystem and are heavily dependant on that not changing too much from year to year. Food production will especially fall into this category. If the ecology of a whole region changes then the human systems that depended upon that ecology could be put under extreme stress.