Yes. Takes a lot of resources to grow livestock for their meat. Wild fish are an exception of course. But you don't have to go all out vegetarian to help. Just reduce how much meat you eat and maybe go meatless on one or two days a week.
The Myst trilogy is a good set of books to read. Another set is Arthur C. Clarke's 4 books in the Space Odyssey series.
http://en.wikipedia.org/wiki/Myst_(series)
http://en.wikipedia.org/wiki/Space_Odyssey
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