Patch your pants!
I patched the knees of these (thrifted) work pants for the hubster while he read me an article out of National Geographic about the dire state of our environment.
It was sort of a pain because I had to rip out the side seam to get the pants onto the sewing machine, but they came out great. Of course, now I have to add some more patches because there are new holes up near the pockets, but I'd rather patch these until there isn't anything left than contribute to the destruction of the planet by buying a new pair.
Hooray for recycling!