We have used shredded paper for years to start fires in our woodstove. As it is enclosed and the pipes are kept clean, embers (if there were any) would not be an issue. There is no mess or perhaps we are unusually tidy and this might be an issue for some. We have wooded acreage and trees will naturally fall or die so wood is plentiful for us.
We share our newspapers with neighbors so that everyone has access to the paper without having to pay for a costly subscription.
We do not have many options for recycling in our part of the country and no humane society in our area. The nearest animal shelter (50 miles away) prefers new blankets for their animals. Thank you so much for your care for animals and donating your shreds to your Humane Society where they are able to make good use of them.
Blessings