berlin president donald trump quit paris climate agreement u.s. producers gain competitive advantage european rival create market distortions eu respond german chancellor candidate martin schulz say mr trump want leave climate pact must talk openly trade relations market distortions schulz say suggest backslide environmental standards could harm u.s. access world large market schulz centre-left social democratic party candidate oust conservative chancellor angela merkel september election party currently run second poll behind merkel conservative bloc eu could respond 'market distortions u.s. quit climate pact schulz