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John Wyndham's "Day of the Triffids" is rooted enough in reality not to alienate non-sci-fi readers, and is a very interesting take on the collapse of society after a catastrophe. I'd also suggest Pierre Boulle's original "Monkey Planet", different enough from the Apes movies to make it almost a completely different story. Good stuff.
How about an "augmented reality" Google Earth plug-in that would allow you to see EXACTLY what cities you're passing over from an airplane window? (Assuming you can be using your phone up there)