The purpose of a cell phone cover is to protect your phone from impact forces. How does a cell phone case do this?

That depends on what kind of environ meant it is in  in space it has the same force that was applied when the velocity was gained

Honestly "global warming" may be a slight possiblity, however they called it "climate change" because its not real, in fact we had one of our coldest days here not too long ago, and the "issues" with this subject is a blindfold for actual problems.