Here's why:
* Schwa sound: The schwa sound (ə) is a very short, unstressed vowel sound. It's often described as the sound in the "a" of "about" or the "e" of "the".
* Climb: The vowel sound in "climb" is a long "i" sound, as in "bike" or "time".
Therefore, "climb" does not have a schwa sound.