'Our' can either be pronounced the same as 'hour' or the same as 'are' The 'r' of 'our' is likely to join onto the beginning of the word 'environment' The 'n' in the middle of 'environment' is practically silent. I'd say this phrase something like this : /au(r) ɪn 'vai rə mənt/ ɪnˈvaɪ.rən.mənt

Like this: ou ren vi ron ment. http://howjsay.com/index.php?word=our http://howjsay.com/index.php?word=environment