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Over the past century, large areas of forest have been cleared for farms, residential and commercial areas by one billion people in China. This encroaching huamn settlement forces pandas to leave their homes and retreat higher into the mountains.

Does the above sample sound right, especially the underlined parts? Thanks.
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Over the past century, large areas of forest have been cleared for farms, residential and commercial areas by one billion people in China. This encroaching huamn settlement forces pandas to leave their homes and retreat higher into the mountains.

As it stands, the words "farms" can't be linked in a series with "residential and commercial" to describe "areas". You don't say "farms areas," which is how it reads now.

farming, residential and commercial areas
or
farms or residential and commercial areas

by one billion people in China. - Are 1 billion people really clearing land? Or is it to make way for the one billion people? I have this image of millions and millions of people out there with chain saws.

This encroaching human settlement forces pandas to leave their homes and retreat higher into the mountains. - this is okay. As humans push further into the areas that pandas have lived in, they have to go higher into the mountain.
Comments  
Thanks, GG, for the terrific correction.