Dear Sande,
It can be hard during the summer to find enough browns.  Here's what I do and it works fine.  You can shred up paper bags or newspaper.  That will provide enough carbon to keep the ratio.  If you know a carpenter you can also ask for bags of wood shavings (the untreated kind)  They work really well also in keeping down flies.
Good luck,
Maureen Tate

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