1) The city of Melbourne, Australia has implemented a program where residents can email individual trees in the city that have been mapped and assigned identification numbers. 2) Over 3,000 emails have been sent to trees in the past two years, with residents sharing messages of appreciation for the trees or asking about their well-being. The trees provide polite responses through the city council. 3) Critics question if trees responding to emails suggesting human-like interactions is appropriate, but supporters argue it contributes to Melbourne's reputation as the world's most livable city by encouraging community connections.