It's Always Sunny in Philadelphia (2005)

S3E1 The Gang Finds a Dumpster Baby

Title: The Gang Discovers a Baby in a Trash Bin Plot: Dennis becomes involved with a group focused on environmental activism, but his noble aims take a hit when the members dismiss him. Meanwhile, Dee and Mac stumble upon a baby in a dumpster and attempt to care for it, only to realize that parenting is far more challenging than they anticipated. Meanwhile, Frank and Charlie take their recycling obsession to extremes, pushing the boundaries of what it means to reuse.