Don’t throw them away! Give them away!. They have so many uses: tarps for working on cars, or covering outdoor equipment, hauling leaves, ground covers for tents, drop cloth for outdoor painting. I’ll bet there are plenty of resident that have a use for them. Even if they were cut into 4×8 sheets they are useful to carry in the car in case of emergency. If you put up a sign offering them for free (or for a dollar donation to the coffee fund) they would be gone in a second and they would be used. Reuse is the highest form of recycling.