Trash is the sort of film one desperately wishes to be kind about — heart supremely, if not burstingly, in the right place and all that — but it doesn’t make life easy for itself. Directed by Stephen Daldry, with a script by Richard Curtis, and set amid the kids who work the rubbish dumps of Rio de Janeiro, this aspires to combine (I think) the lively spirit and warmth of Slumdog Millionaire with the hard-hitting social agenda of City of God, but in working both angles, it doesn’t pull off either one.