Human activities have caused both acid rain and a global increase in temperature, or global warming. How are these two effects-acid rain and global warming-related to each other?
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Acid rain is a side effect of global warming at the local level.
Both acid rain and global warming are caused by the burning of fossil fuels.
Acid rain is a side effect of efforts to reduce global warming.
Both acid rain and global warming are caused by increased levels of pollution.