I can't tell the difference between two sentences
a) Greenpeace said that the beer industry should stick to existing glass bottles, for which a recycling system exists.
b) Greenpeace said that the beer industry should stick to existing glass bottles for which a recycling system exists.
Without more context (the comma, or lack of one, after the word "bottles" determines the meaning): a) means that a recycling system is currently in place for all of the glass beer bottles that the beer industry currently uses. So the complete sentence means that the beer industry should keep using all of the glass beer bottles that it currently uses. b) means that a recycling system is currently in place for some, but not all, of the glass beer bottles that the beer industry currently uses.
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Without more context (the comma, or lack of one, after the word "bottles" determines the meaning):
a) means that a recycling system is currently in place for all of the glass beer bottles that the beer industry currently uses. So the complete sentence means that the beer industry should keep using all of the glass beer bottles that it currently uses.
b) means that a rec
The first sentence implies that a recycling system is available for all existing glass bottles (that are used by the industry).
The second sentence implies that a recycling system exists for some existing glass bottles but not others, and the industry should stick to the former.